Fixed potential error in the properties dialog for the Code tab. Fixes #4845.

docs/en_US/release_notes_4_15.rst

@@ -17,4 +17,5 @@ Housekeeping
 Bug fixes
 *********
 
+| `Issue #4845 <https://redmine.postgresql.org/issues/4845>`_ -  Fixed potential error in the properties dialog for the Code tab.
 | `Issue #4850 <https://redmine.postgresql.org/issues/4850>`_ -  Fixed an issue where Datetimepicker control opens when clicking on the label.

web/pgadmin/static/js/backform.pgadmin.js

@@ -689,6 +689,7 @@ define([
         }
         var el = $((tmpls['panel'])(_.extend(o, {
           'tabIndex': idx,
+          'tabPanelCodeClass': o.tabPanelCodeClass ? o.tabPanelCodeClass : '',
         })))
           .appendTo(tabContent)
           .removeClass('collapse').addClass('collapse');