Revert part of the previous commit: tollerate errors in inputs to allow testing of invalid inputs. #1703.

Author: sangwinc

stack/questiontestresult.php

@@ -344,11 +344,6 @@ public function passed() {
         if ($this->emptytestcase) {
             return false;
         }
-        foreach ($this->get_input_states() as $state) {
-            if ($state->errors !== "") {
-                return false;
-            }
-        }
         foreach ($this->get_prt_states() as $state) {
             if (!$state->testoutcome) {
                 return false;