don't reimport DvcException

Mr. Outis · Mr. Outis · commit df97a2a7deb9 · 2020-01-10T18:32:34.000-06:00
diff --git a/dvc/system.py b/dvc/system.py
@@ -91,7 +91,6 @@ def _reflink_linux(src, dst):
     @staticmethod
     def reflink(source, link_name):
         import platform
-        from dvc.exceptions import DvcException
 
         source, link_name = fspath(source), fspath(link_name)
 
