Syntax error fixed

submissions/services.py

@@ -57,7 +57,7 @@ class ArxivCaller():
             if previous_submissions[0].status == 'revision_requested':
                 self.resubmission = True
                 self.previous_submissions = previous_submissions
-            else if previous_submissions[0].status in ['rejected', 'rejected_visible']:
+            elif previous_submissions[0].status in ['rejected', 'rejected_visible']:
                 self.errorcode = 'previous_submissions_rejected'
                 self.isvalid = False
                 return