Bug 1621322 - mozversioncontrol: pre-existing bug fix, do not run git test under hg r=ahal

Differential Revision: https://phabricator.services.mozilla.com/D67584

--HG--
extra : moz-landing-system : lando

python/mozversioncontrol/test/test_push_to_try.py

@@ -52,6 +52,9 @@ def test_push_to_try(repo, monkeypatch):
 
 
 def test_push_to_try_missing_extensions(repo, monkeypatch):
+    if repo.vcs != 'git':
+        return
+
     vcs = get_repository_object(repo.strpath)
 
     orig = vcs._run