Fix missed import from d3a7282

The `finalize_process` method was moved but this import wasn't carried with it.

Author: brondsem

git/util.py

@@ -13,6 +13,8 @@
 import tempfile
 import platform
 
+from exc import GitCommandError
+
 from gitdb.util import (
 							make_sha, 
 							LockedFD,