Fix small bug when no svn repo was found.

Somewhere during development the find_svn_branch_name function
returned a tuple, so if no repo was found I returned a (None, None)
tuple.

After changing what the function returned when an svn repo is found, I
must have forgotten to also change the return value in the case
nothing is found.

Author: markvl

git-svn-check-unpushed

@@ -66,7 +66,7 @@ def find_svn_branch_name():
         # and make it the next commit to investigate
         if current_commit in commits:
             current_commit = commits[current_commit]
-    return None, None
+    return None
 
 
 def find_uncommitted(svn_branch):