sidebar navigation now works after erroneous page; fixes #721

(cherry picked from commit 4ab7ba3)

model/Vocabulary.php

@@ -435,8 +435,15 @@ public function getConceptRelateds($uri, $lang)
     public function getConceptInfo($uri, $clang)
     {
         $sparql = $this->getSparql();
-
-        return $sparql->queryConceptInfo($uri, $this->config->getArrayClassURI(), array($this), $clang);
+        $conceptInfo = null;
+        try {
+            $conceptInfo = $sparql->queryConceptInfo($uri, $this->config->getArrayClassURI(), array($this), $clang);
+        } catch (EasyRdf\Http\Exception | EasyRdf\Exception | Exception | Throwable $e) {
+             if ($this->model->getConfig()->getLogCaughtExceptions()) {
+                 error_log('Caught exception: ' . $e->getMessage());
+             }
+        }
+        return $conceptInfo;
     }
 
     /**

resource/css/styles.css

@@ -514,6 +514,10 @@ ul.dropdown-menu > li:last-child > input {
   margin: 15px;
 }
 
+.search-result-listing > .alert > h4 {
+  margin: 10px 0px;
+}
+
 .search-result-listing .search-count {
   text-align: left;
   margin-left: 15px;
@@ -1212,6 +1216,10 @@ li.sub-group {
   line-height: 1.1;
 }
 
+.page-alert > h3 {
+  margin: 10px 0px;
+}
+
 .search-result-listing .deprecated-alert {
   margin-left: 10px;
   color: #D95F8A;

view/error-page.twig

@@ -1,7 +1,11 @@
 {% extends "light.twig" %}
 {% block title %}: Error page{% endblock %}
 {% block error %}
-  <div class="alert {% if request.vocabid != '' or request.page == 'feedback' or request.page == 'about' %}page-alert{% else %}frontpage-alert{% endif %}">
-    <h3>{% if not message %}{% trans %}404 Error: The page {{ requested_page }} cannot be found.{% endtrans %}{% else %}{{ message }}{% endif %}</h3>
+<div id="maincontent">
+  <div class="content">
+    <div class="alert {% if request.vocabid != '' or request.page == 'feedback' or request.page == 'about' %}page-alert{% else %}frontpage-alert{% endif %}">
+      <h3>{% if not message %}{% trans %}404 Error: The page {{ requested_page }} cannot be found.{% endtrans %}{% else %}{{ message }}{% endif %}</h3>
+    </div>
   </div>
+</div>
 {% endblock %}