Do not modify form if not existent

Change-Id: I0bb9fb1909edc850b57039e0b5efc55cc5587fb9
diff --git a/dev/js/src/init.js b/dev/js/src/init.js
index 58c604d..1e9a805 100644
--- a/dev/js/src/init.js
+++ b/dev/js/src/init.js
@@ -433,11 +433,10 @@
     var queryPanel = queryPanelClass.create();
 
     // Get input field
-    var sform = d.getElementById("searchform");
     var vcView = d.getElementById('vc-view')
-    if (sform && vcView) {
+    if (form && vcView) {
       // The views are below the query bar
-      sform.insertBefore(queryPanel.element(), vcView);
+      form.insertBefore(queryPanel.element(), vcView);
       KorAP.Panel['query'] = queryPanel;
     };
 
@@ -475,11 +474,15 @@
           if (json && json.length > 0) {
 
             // Add state manager
-            const input = d.getElementById("searchform").addE("input");
+            form = d.getElementById("searchform");
+            if (!form) {
+              return;
+            };
+
+            const input = form.addE("input");
             input.setAttribute("name","state");
             KorAP.States = stateManagerClass.create(input);
             
-            
             // Load Plugin Server first
             KorAP.Plugin = pluginClass.create();