Fixed 'can't execute an empty query' message if the user change the option of Auto FK Index. Fixes #5835

docs/en_US/release_notes_4_27.rst

@@ -32,6 +32,7 @@ Bug fixes
 | `Issue #5807 <https://redmine.postgresql.org/issues/5807>`_ -  Fixed an issue where a column is renamed and then removed, then the drop SQL query takes the wrong column name.
 | `Issue #5826 <https://redmine.postgresql.org/issues/5826>`_ -  Fixed an issue where schema diff is showing identical table as different due to default vacuum settings.
 | `Issue #5830 <https://redmine.postgresql.org/issues/5830>`_ -  Fixed reverse engineering SQL where parenthesis is not properly arranged for View/MView definition.
+| `Issue #5835 <https://redmine.postgresql.org/issues/5835>`_ -  Fixed 'can't execute an empty query' message if the user change the option of Auto FK Index.
 | `Issue #5839 <https://redmine.postgresql.org/issues/5839>`_ -  Ensure that multiple extensions can be dropped from the properties tab.
 | `Issue #5841 <https://redmine.postgresql.org/issues/5841>`_ -  Fixed an issue where the server is not able to connect using the service.
 | `Issue #5843 <https://redmine.postgresql.org/issues/5843>`_ -  Fixed an issue where the 'PARALLEL UNSAFE' option is missing from reverse engineering SQL of function/procedure.
@@ -40,4 +41,4 @@ Bug fixes
 | `Issue #5861 <https://redmine.postgresql.org/issues/5861>`_ -  Ensure that the 'Remove Server' option should be visible in the context menu.
 | `Issue #5867 <https://redmine.postgresql.org/issues/5867>`_ -  Fixed an issue where some properties are not being updated correctly for the shared server.
 | `Issue #5882 <https://redmine.postgresql.org/issues/5882>`_ -  Fixed invalid literal issue when fetching dependencies for Materialized View.
-| `Issue #5885 <https://redmine.postgresql.org/issues/5885>`_ -  Fixed an issue where the user is unable to change the macro name.
+| `Issue #5885 <https://redmine.postgresql.org/issues/5885>`_ -  Fixed an issue where the user is unable to change the macro name.

web/pgadmin/browser/server_groups/servers/databases/schemas/tables/constraints/foreign_key/static/js/foreign_key.js

@@ -814,6 +814,9 @@ define('pgadmin.node.foreign_key', [
             onText: gettext('Yes'),
             offText: gettext('No'),
           },disabled: function(m) {
+            // Don't allow to edit the auto index setting in edit mode
+            if(!m.isNew())
+              return true;
             var index = m.get('coveringindex'),
               autoindex = m.get('autoindex'),
               setIndexName = function() {