Fix submission page in shadow mode for non-external submissions

Author: nickygerritsen

webapp/templates/jury/partials/submission_graph.html.twig

@@ -18,7 +18,7 @@
             </div>
         </div>
     {% endif %}
-    {% if externalJudgement is not null and externalJudgement.result is not null %}
+    {% if externalJudgement is not null and externalJudgement.result is not null and externalJudging is defined %}
         <div class="card" style="display: inline-block" id="externalruntime">
             <div class="card-header">
                 <span id="graphs" style="font-weight: bold;">External Testcase CPU times

webapp/templates/jury/submission.html.twig

@@ -551,11 +551,11 @@
                                 {{ externalRuns | displayTestcaseResults(externalJudgement.endtime is not empty, true) }}
                             </td>
                             <td>
-                                {% if externalSubmissionUrl and externalSubmissionUrl is not empty %}
+                                {% if externalSubmissionUrl is defined and externalSubmissionUrl is not empty %}
                                 <a href="{{ externalSubmissionUrl }}">
                                     {% endif %}
                                     external {{ externalJudgement.extjudgementid }}
-                                    {% if externalSubmissionUrl and externalSubmissionUrl is not empty %}
+                                    {% if externalSubmissionUrl is defined and externalSubmissionUrl is not empty %}
                                 </a>
                                 {% endif %}
                             </td>