fix(Tinebase): auto edit dialogs can fail

- internal fields get no field any longer

Change-Id: I75f01b5c1bef5ed4cc6bb83c719ebe4510464f0d
Reviewed-on: http://gerrit.tine20.com/customers/18527
Tested-by: Jenkins CI (http://ci.tine20.com/) <tine20-jenkins@metaways.de>
Reviewed-by: Cornelius Weiss <c.weiss@metaways.de>

tine20/Tinebase/js/widgets/form/RecordForm.js

@@ -98,7 +98,7 @@ Tine.widgets.form.RecordForm.getFormHeight = function(recordClass) {
     Ext.each(fieldDefinitions, function(fieldDefinition) {
         var app = Tine.Tinebase.appMgr.get(recordClass.getMeta('appName')),
             field = Tine.widgets.form.FieldManager.get(app, recordClass, fieldDefinition.fieldName, 'editDialog'),
-            height = field.height+25 || 42;
+            height = field ? (field.height+25 || 42) : 0;
 
         formHeight += height;
     });