Fix the version checker to tolerate errors better

sickbeard/versionChecker.py

@@ -286,7 +286,14 @@ class GitUpdateManager(UpdateManager):
 
     def _find_git_branch(self):
 
-        return self._run_git('symbolic-ref -q HEAD')[0].strip().replace('refs/heads/', '', 1) or 'master'
+        branch_info = self._run_git('symbolic-ref -q HEAD')
+
+        if not branch_info:
+            return 'master'
+
+        branch = branch_info[0].strip().replace('refs/heads/', '', 1)
+
+        return branch or 'master'
 
 
     def _check_github_for_update(self):