Fixed list sorting issue in the schema diff tool. Fixes #5440

Fixed an issue while comparing the two identical schemas using the schema diff tool. Fixes #5449

docs/en_US/release_notes_4_22.rst

@@ -23,6 +23,8 @@ Bug fixes
 | `Issue #3694 <https://redmine.postgresql.org/issues/3694>`_ -  Gracefully informed the user that the database is already connected when they click on "Connect Database...".
 | `Issue #4279 <https://redmine.postgresql.org/issues/4279>`_ -  Ensure that file browse "home" button should point to $HOME rather than /.
 | `Issue #5422 <https://redmine.postgresql.org/issues/5422>`_ -  Ensure that the dependencies tab shows correct information for Synonyms.
+| `Issue #5440 <https://redmine.postgresql.org/issues/5440>`_ -  Fixed list sorting issue in the schema diff tool.
+| `Issue #5449 <https://redmine.postgresql.org/issues/5449>`_ -  Fixed an issue while comparing the two identical schemas using the schema diff tool.
 | `Issue #5466 <https://redmine.postgresql.org/issues/5466>`_ -  Correct ipv4 "all interfaces" address in the container docs, per Frank Limpert.
 | `Issue #5469 <https://redmine.postgresql.org/issues/5469>`_ -  Fixed an issue where select2 hover is inconsistent for the SSL field in create server dialog.
 | `Issue #5473 <https://redmine.postgresql.org/issues/5473>`_ -  Fixed post-login redirect location when running in server mode under a non-default root.

web/pgadmin/tools/schema_diff/directory_compare.py

@@ -471,13 +471,13 @@ def sort_list(source, target):
     :return:
     """
     # Check the above keys are exist in the dictionary
-    if len(source) > 0:
+    if len(source) > 0 and type(source[0]) == dict:
         tmp_key = is_key_exists(list_keys_array, source[0])
         if tmp_key is not None:
             source = sorted(source, key=lambda k: k[tmp_key])
 
     # Check the above keys are exist in the dictionary
-    if len(target) > 0:
+    if len(target) > 0 and type(target[0]) == dict:
         tmp_key = is_key_exists(list_keys_array, target[0])
         if tmp_key is not None:
             target = sorted(target, key=lambda k: k[tmp_key])