[meld/VersionControlRework: 15/123] meld.vc._vc: Fix tree cache for some per-VC wrangling

[Kai Willadsen <kaiw src gnome org>]

commit df658ae05b9c9096183d3a564c358531cfe75d8f
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sun Mar 22 07:30:37 2015 +1000

    meld.vc._vc: Fix tree cache for some per-VC wrangling

 meld/vc/_vc.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/meld/vc/_vc.py b/meld/vc/_vc.py
index 5cf58ae..25b9ac0 100644
--- a/meld/vc/_vc.py
+++ b/meld/vc/_vc.py
@@ -196,7 +196,7 @@ class Vc(object):
         raise NotImplementedError()
 
     def _get_tree_cache(self, directory):
-        if self._tree_cache is None:
+        if not self._tree_cache:
             self._tree_cache = self.cache_tree(directory)
         return self._tree_cache