updated evaluation endpoint to respond to auth first

Author: hxi1

tabpy/tabpy_server/handlers/evaluation_plane_handler.py

@@ -40,6 +40,9 @@ def initialize(self, executor, app):
 
     @gen.coroutine
     def post(self):
+        if self.should_fail_with_auth_error() != AuthErrorStates.NONE:
+            self.fail_with_auth_error()
+            return
         self.error_out(404, "Ad-hoc scripts have been disabled on this analytics extension, please contact your "
                             "administrator.")