Only show contest samples zip when there are attachments

Author: vmcj

webapp/src/Service/DOMJudgeService.php

@@ -1130,6 +1130,7 @@ public function getTwigDataForProblemsAction(
             'problems' => $problems,
             'samples' => $samples,
             'showLimits' => $showLimits,
+            'showSamples' => $this->checkIfSamplesZipForContest($contest),
             'defaultMemoryLimit' => $defaultMemoryLimit,
             'timeFactorDiffers' => $timeFactorDiffers,
             'clarifications' => $clars,

webapp/templates/partials/problem_list.html.twig

@@ -17,9 +17,11 @@
                 problemset
             </a>
         {% endif %}
-        <a class="btn btn-secondary" href="{{ path('current_samples_data_zip', {cid: contest.cid}) }}" title="Contains samples, attachments and statement for all problems.">
-            <i class="fas fa-download"></i> samples
-        </a>
+        {% if showSamples %}
+            <a class="btn btn-secondary" href="{{ path('current_samples_data_zip', {cid: contest.cid}) }}" title="Contains samples, attachments and statement for all problems.">
+                <i class="fas fa-download"></i> samples
+            </a>
+        {% endif %}
     {% endif %}
 </h1>