fix: E241 whitespace and add CHANGELOG entry

- Remove extra spaces after ':' in test dict literals (flake8 E241)
- Add CHANGELOG.rst entry under 'in development' for #6375

Author: balgaly

CHANGELOG.rst

@@ -16,7 +16,7 @@ Redis       8.6
 
 Fixed
 ~~~~~
-
+* Fix ``TypeError`` when displaying help for actions whose parameters have no ``description`` key. #6375
 
 Changed
 ~~~~~~~

st2client/tests/unit/test_command_actionrun.py

@@ -411,10 +411,10 @@ def test_sort_parameters_mixed_position_types(self):
         command = ActionRunCommand(action, self, subparser, name="test")
 
         parameters = {
-            "host":    {"type": "string", "position": 0},
+            "host": {"type": "string", "position": 0},
             "timeout": {"type": "integer", "position": 1},
             "verbose": {"type": "boolean"},
-            "output":  {"type": "string"},
+            "output": {"type": "string"},
         }
         names = ["verbose", "output", "host", "timeout"]