git-try was broken by r37650

TEST=none
BUG=none
TBR=nasser

Review URL: http://codereview.chromium.org/548223

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@37692 0039d316-1c4b-4281-b951-d872f2087c98

git-try

@@ -19,13 +19,13 @@ import trychange
 def GetRietveldIssueNumber():
   return GIT.Capture(
       ['config', 'branch.%s.rietveldissue' % GIT.GetBranch(None)],
-      error_ok=True)
+      error_ok=True)[0]
 
 
 def GetRietveldPatchsetNumber():
   return GIT.Capture(
       ['config', 'branch.%s.rietveldpatchset' % GIT.GetBranch(None)],
-      error_ok=True)
+      error_ok=True)[0]
 
 
 def GetRietveldServerUrl():