fix: angular convention logic

Author: andre-filho

conventions/karma_angular.py

@@ -2,5 +2,6 @@ def angular_convention(tag, msg, context):
     tag = tag.lower()
     if context is '':
         composed_message = "%s: %s\n" % (tag, msg)
-    composed_message = "%s(%s): %s\n" % (tag, context, msg)
+    else:
+        composed_message = "%s(%s): %s\n" % (tag, context, msg)
     return composed_message