Account for the OS returning an empty certificate chain.

net/data/ssl/certificates/large_key.pem

+Certificate:
+    Data:
+        Version: 1 (0x0)
+        Serial Number:
+            fa:ba:a5:10:ef:85:bb:70
+        Signature Algorithm: sha256WithRSAEncryption
+        Issuer: C=US, ST=California, L=Mountain View, O=Test CA, CN=127.0.0.1
+        Validity
+            Not Before: Apr 23 21:32:21 2015 GMT
+            Not After : Apr 20 21:32:21 2025 GMT
+        Subject: C=US, ST=California, L=Mountain View, O=Test CA, CN=127.0.0.1
+        Subject Public Key Info:
+            Public Key Algorithm: rsaEncryption
+            RSA Public Key: (4104 bit)
+                Modulus (4104 bit):
+                    00:c9:98:35:7d:a5:d4:41:1b:83:60:84:76:14:c2:
+                    0d:a6:7f:e7:52:15:a5:7c:96:96:56:b8:98:f9:bc:
+                    94:56:23:14:f2:74:05:e6:ba:d9:3a:58:dd:b5:03:
+                    9c:d1:f5:47:76:c2:45:78:f9:b8:e1:44:40:45:08:
+                    2d:d1:ff:c3:bf:d7:b2:4a:94:6a:61:37:dd:cb:66:
+                    22:28:8d:cc:5f:35:dd:9a:1a:d5:0e:cc:36:76:ae:
+                    65:a2:96:d3:cd:de:8d:b4:c9:28:a8:a8:2d:45:89:
+                    98:aa:7d:9e:12:7b:e1:a5:ba:d9:56:8a:4a:1f:1c:
+                    7d:e2:cf:f5:f0:54:38:6d:47:4c:1d:1c:22:3c:74:
+                    72:4b:fd:c2:97:66:b1:9c:8e:c3:d6:88:5e:6a:ed:
+                    c9:fe:b7:d9:ef:03:25:5d:da:4a:ab:5e:fa:f4:a8:
+                    87:30:90:00:85:a6:5b:40:77:b6:34:64:63:58:05:
+                    cd:1e:58:d6:fd:b2:13:51:ba:a4:9f:7f:e3:db:88:
+                    88:58:1f:df:5f:67:cc:49:0a:bb:e0:ce:d9:3f:ce:
+                    26:20:1e:35:f3:f0:8a:bd:8b:8b:4f:16:80:53:4e:
+                    44:3b:1a:9e:60:6b:ff:cf:f7:9f:40:bf:d2:86:e4:
+                    79:39:3a:d7:5a:bd:d0:63:cf:f6:54:e1:9e:09:e7:
+                    63:8a:17:33:bf:f2:5f:ec:ee:45:18:52:ee:e7:23:
+                    a2:a8:af:d2:85:4b:bb:f9:12:ba:35:22:d2:5e:9c:
+                    42:2d:66:e1:01:02:d4:0f:ff:86:1c:91:8f:55:9c:
+                    9f:24:4e:17:c8:23:c1:a7:4e:39:ed:4b:dc:b8:c4:
+                    3f:7d:c9:0f:ff:01:40:4d:dd:9a:55:29:84:f8:52:
+                    72:da:38:32:9a:ef:2b:2e:67:5b:d2:2d:70:46:91:
+                    42:79:22:a2:08:c0:fd:24:95:9e:04:a6:5c:9e:c0:
+                    ed:25:2a:57:62:17:b7:c0:12:d4:8b:59:f3:db:8b:
+                    cd:95:4f:d9:32:f2:f0:e1:14:9b:db:73:e7:b4:97:
+                    a6:90:f7:0d:cb:59:93:94:12:2a:c1:28:7d:3c:bd:
+                    b5:7e:bb:13:c0:4c:ef:ce:20:3d:3b:4f:84:25:77:
+                    dc:1f:0f:08:dd:76:9c:ad:7d:00:2f:23:42:6a:37:
+                    e9:d0:6b:8e:9a:6f:3b:46:09:74:23:43:a9:58:46:
+                    62:33:69:2a:0c:df:cd:6c:75:88:f1:01:3d:67:e0:
+                    a8:e3:bd:23:03:66:f3:11:f2:07:a8:bf:4b:c9:81:
+                    ce:a9:ed:8d:48:a6:10:15:fb:79:27:ae:2e:8f:35:
+                    c5:39:12:eb:f2:b7:28:d3:b3:e7:4c:71:d8:e1:d1:
+                    f7:39:94:87
+                Exponent: 65537 (0x10001)
+    Signature Algorithm: sha256WithRSAEncryption
+        2d:3b:5f:58:30:58:97:65:d0:36:a6:03:0c:6b:bc:a6:5b:e7:
+        8f:a3:a7:05:5d:db:9b:3f:0e:22:89:3e:e1:00:91:3c:17:ab:
+        10:10:80:f5:d1:f9:cb:d7:38:9e:bc:36:a0:31:d2:e3:2f:98:
+        62:d8:a2:cd:73:7c:56:29:b0:c0:41:01:71:50:70:7a:b2:9d:
+        b6:ad:13:71:d8:19:7d:4f:7a:be:4b:36:2e:d7:f7:81:53:a7:
+        e0:7f:04:77:09:84:a3:56:22:48:7e:6d:ca:20:12:ed:a7:da:
+        29:cf:46:46:81:8f:97:4b:17:63:25:f2:18:48:c1:82:21:c7:
+        be:4f:54:29:88:29:78:d0:be:98:9c:d9:4f:76:e7:6b:a2:10:
+        4a:ce:45:02:c7:5e:5a:ac:5f:0e:4b:a3:51:a9:ec:7a:3f:a0:
+        51:49:75:bc:af:f4:89:88:35:69:65:15:a5:33:c5:2f:1e:c5:
+        30:98:6b:04:14:b9:29:b5:31:76:23:88:32:72:29:e4:16:de:
+        bb:95:d6:bb:48:e5:38:37:57:6e:8a:2f:c0:64:2c:01:4d:e6:
+        69:9e:ae:4a:39:87:96:5d:50:e6:25:08:46:77:ea:da:4d:b2:
+        bd:5e:44:ca:e2:46:b1:7a:4a:3d:83:16:a9:a6:e5:c4:ef:fc:
+        af:77:58:6e:3b:cd:b3:b3:0e:d2:59:d2:be:16:ac:64:fa:f7:
+        b1:06:02:7d:c9:8a:06:65:73:da:d8:a8:02:41:d5:68:41:7a:
+        0f:a7:5c:90:b3:6f:01:66:65:96:4c:50:bd:c7:38:67:61:21:
+        52:dc:a9:f0:f7:0b:16:95:2d:5d:b8:0b:da:9a:fe:f8:4c:e9:
+        fa:6a:32:a7:d4:67:7b:21:45:7a:4e:7c:a6:fa:cb:65:3d:8f:
+        38:90:5a:29:7d:7f:21:32:6d:c6:61:70:f9:a8:4e:3f:9b:3c:
+        f0:4b:40:d6:7d:e5:d6:31:08:ff:29:21:f9:e7:81:36:1a:86:
+        d5:96:06:1d:1e:b1:fc:4c:e3:6d:ce:3a:2c:16:b8:03:76:f3:
+        70:77:15:ea:b5:32:c3:f5:9f:a6:61:e1:29:bb:88:2c:a0:cf:
+        05:f5:3d:97:ae:b5:b9:01:e8:2f:5e:54:17:2e:09:5b:ea:d0:
+        4a:95:65:d9:cf:83:3a:bc:1d:7d:28:4b:7b:8d:5c:ef:8a:06:
+        f9:64:b5:ec:3f:73:fc:6c:58:cc:57:da:d3:5d:5e:b5:58:43:
+        53:27:f0:49:01:e4:45:8d:eb:68:f3:40:fc:ec:63:62:ce:c3:
+        d9:97:d3:a3:51:8c:c5:09:a9:81:6e:23:e0:6a:1f:02:b0:f8:
+        b0:40:0c:2f:ea:ee:c2:1f:1b
+-----BEGIN CERTIFICATE-----
+MIIFPjCCAyUCCQD6uqUQ74W7cDANBgkqhkiG9w0BAQsFADBgMQswCQYDVQQGEwJV
+UzETMBEGA1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNTW91bnRhaW4gVmlldzEQ
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+CSqGSIb3DQEBCwUAA4ICAgAtO19YMFiXZdA2pgMMa7ymW+ePo6cFXdubPw4iiT7h
+AJE8F6sQEID10fnL1zievDagMdLjL5hi2KLNc3xWKbDAQQFxUHB6sp22rRNx2Bl9
+T3q+SzYu1/eBU6fgfwR3CYSjViJIfm3KIBLtp9opz0ZGgY+XSxdjJfIYSMGCIce+
+T1QpiCl40L6YnNlPdudrohBKzkUCx15arF8OS6NRqex6P6BRSXW8r/SJiDVpZRWl
+M8UvHsUwmGsEFLkptTF2I4gycinkFt67lda7SOU4N1duii/AZCwBTeZpnq5KOYeW
+XVDmJQhGd+raTbK9XkTK4kaxeko9gxappuXE7/yvd1huO82zsw7SWdK+Fqxk+vex
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+mv74TOn6ajKn1Gd7IUV6Tnym+stlPY84kFopfX8hMm3GYXD5qE4/mzzwS0DWfeXW
+MQj/KSH554E2GobVlgYdHrH8TONtzjosFrgDdvNwdxXqtTLD9Z+mYeEpu4gsoM8F
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+XV61WENTJ/BJAeRFjeto80D87GNizsPZl9OjUYzFCamBbiPgah8CsPiwQAwv6u7C
+Hxs=
+-----END CERTIFICATE-----