templates/content-display: Remove script tag when no content to display

When a content cannot be displayed (for instance due to a too large size),
remove script tag from template to prevent execution errors.

Closes T3454

swh/web/templates/includes/content-display.html

@@ -49,31 +49,33 @@ See top-level LICENSE file for more information
     </div>
   </div>
 
-  <script>
-    {% if "application/pdf" == mimetype %}
-      swh.webapp.renderPdf({{ top_right_link.url|jsonify }});
-    {% elif filename and filename|default:""|slice:"-5:" == "ipynb" %}
-      swh.webapp.renderNotebook({{ top_right_link.url|jsonify }}, '.swh-ipynb');
-    {% elif content %}
-      let codeContainer = $('code');
-      let content = codeContainer.text();
+  {% if content %}
+    <script>
+      {% if "application/pdf" == mimetype %}
+        swh.webapp.renderPdf({{ top_right_link.url|jsonify }});
+      {% elif filename and filename|default:""|slice:"-5:" == "ipynb" %}
+        swh.webapp.renderNotebook({{ top_right_link.url|jsonify }}, '.swh-ipynb');
+      {% elif content %}
+        let codeContainer = $('code');
+        let content = codeContainer.text();
 
-      swh.webapp.highlightCode();
+        swh.webapp.highlightCode();
 
-      function updateLanguage(language) {
-        codeContainer.text(content);
-        codeContainer.removeClass();
-        codeContainer.addClass(language);
+        function updateLanguage(language) {
+          codeContainer.text(content);
+          codeContainer.removeClass();
+          codeContainer.addClass(language);
 
-        let urlParams = new URLSearchParams(window.location.search);
-        urlParams.set('language', language);
+          let urlParams = new URLSearchParams(window.location.search);
+          urlParams.set('language', language);
 
-        const newUrl = window.location.pathname + '?' + urlParams.toString() + window.location.hash;
-        window.history.replaceState('', document.title, newUrl);
+          const newUrl = window.location.pathname + '?' + urlParams.toString() + window.location.hash;
+          window.history.replaceState('', document.title, newUrl);
 
-        swh.webapp.highlightCode();
-      }
+          swh.webapp.highlightCode();
+        }
 
-    {% endif %}
-  </script>
+      {% endif %}
+    </script>
+  {% endif %}
 {% endif %}