Fix break for devices with no IMEI .

build/android/buildbot/bb_device_status_check.py

Index: build/android/buildbot/bb_device_status_check.py
diff --git a/build/android/buildbot/bb_device_status_check.py b/build/android/buildbot/bb_device_status_check.py
index 7e9355778afae505270a11f0ff0d2a2b10920366..c6999a09b96ccc62ef8ed55a137fb1a10782ca99 100755
--- a/build/android/buildbot/bb_device_status_check.py
+++ b/build/android/buildbot/bb_device_status_check.py
@@ -59,7 +59,11 @@ def DeviceInfo(serial, options):
     battery_level = int(re.findall('level: (\d+)', battery)[0])
     battery_temp = float(re.findall('temperature: (\d+)', battery)[0]) / 10
   sub_info = device_adb.GetSubscriberInfo()
-  imei_slice = re.findall('Device ID = (\d+)', sub_info)[0][-6:]
+  imei_slice_match = re.findall('Device ID = (\d+)', sub_info)
+  if imei_slice_match:
+    imei_slice = imei_slice_match[0][-6:]
+  else:
+    imei_slice = 'null'
   report = ['Device %s (%s)' % (serial, device_type),
             '  Build: %s (%s)' %
               (device_build, device_adb.GetBuildFingerprint()),