fix a bug

Author: Takashi Matsuo

monitoring/api/v3/alerts-client/test_config.py

@@ -16,7 +16,7 @@
 
 # Temporary set BUILD_SPECIFIC_GCLOUD_PROJECT in this file.
 kokoro_job_name = os.environ.get('KOKORO_JOB_NAME')
-if 'python3.7' in: kokoro_job_name:
+if kokoro_job_name and 'python3.7' in kokoro_job_name:
     os.environ['BUILD_SPECIFIC_GCLOUD_PROJECT'] = 'tmatsuo-test'
 else:
     os.environ['BUILD_SPECIFIC_GCLOUD_PROJECT'] = os.environ['GCLOUD_PROJECT']