is_git_repo for a non-existent path should be false

Author: telackey

src/stack/util.py

@@ -213,5 +213,7 @@ def is_git_repo(path):
     try:
         _ = git.Repo(path).git_dir
         return True
-    except git.exc.InvalidGitRepositoryError:
-        return False
+    except:
+        pass
+
+    return False