Merge pull request colinta#60 from burtbeckwith/patch-1

Bug fix for unnamed view

Author: colinta

file_diffs.py

@@ -311,7 +311,7 @@ def on_post_diff_tool(from_file, to_file):
             **kwargs)
 
     def is_visible(self):
-        return self.view.file_name() and self.view.is_dirty()
+        return bool(self.view.file_name()) and self.view.is_dirty()
 
 
 class FileDiffFileCommand(FileDiffCommand):