git cl upload for Gerit no-squash: correct detect missing Change-Id.

tests/git_footers_test.py

Index: tests/git_footers_test.py
diff --git a/tests/git_footers_test.py b/tests/git_footers_test.py
index bb6e535506949edc841fd60940cbbd64d2cac4f9..86e8b6d93b08ea22c14a934c954327e3531ea647 100755
--- a/tests/git_footers_test.py
+++ b/tests/git_footers_test.py
@@ -73,6 +73,10 @@ My commit message is my best friend. It is my life. I must master it.
                      '',  # Above is ignored because of this empty line.
                      'Change-Id: Ideadbeaf'])
     self.assertEqual(['Ideadbeaf'], git_footers.get_footer_change_id(msg))
+    self.assertEqual([], git_footers.get_footer_change_id(
+        'desc\nBUG=not-a-valid-footer\nChange-Id: Ixxx'))
+    self.assertEqual(['Ixxx'], git_footers.get_footer_change_id(
+        'desc\nBUG=not-a-valid-footer\n\nChange-Id: Ixxx'))
 
   def testAddFooterChangeId(self):
     self.assertEqual(