Fix submodule check

JukkaL · JukkaL · commit 6437aea98cce · 2015-10-18T16:33:13.000-07:00
diff --git a/mypy/git.py b/mypy/git.py
@@ -114,7 +114,7 @@ def verify_git_integrity_or_abort(datadir: str) -> None:
     Potentially output warnings/errors (to stderr), and exit with status 1
     if we detected a severe problem.
     """
-
+    datadir = datadir or '.'
     if not is_git_repo(datadir):
         return
     if not have_git():
