Don't crash when resource path isn't specified

tests/ColorSpaceTest.cpp

Index: tests/ColorSpaceTest.cpp
diff --git a/tests/ColorSpaceTest.cpp b/tests/ColorSpaceTest.cpp
index 37785e238b8b6c93938e85a8bea7209b6591e2c1..0774a095a7c7f65d6886b55af27a76b883f96653 100644
--- a/tests/ColorSpaceTest.cpp
+++ b/tests/ColorSpaceTest.cpp
@@ -57,9 +57,15 @@ DEF_TEST(ColorSpaceParsePngICCProfile, r) {
 DEF_TEST(ColorSpaceParseJpegICCProfile, r) {
     SkAutoTDelete<SkStream> stream(resource("icc-v2-gbr.jpg"));
     REPORTER_ASSERT(r, nullptr != stream);
+    if (!stream) {
+        return;
+    }
 
     SkAutoTDelete<SkCodec> codec(SkCodec::NewFromStream(stream.release()));
     REPORTER_ASSERT(r, nullptr != codec);
+    if (!codec) {
+        return;
+    }
 
     SkColorSpace* colorSpace = codec->getColorSpace();
     REPORTER_ASSERT(r, nullptr != colorSpace);