Fix: Painter params of column spec are not 'None' anymore

Change-Id: I2e080d3f2f745659382a21fc1bba1ee6e5b9f027

cmk/gui/views/painter/v0/base.py

@@ -335,9 +335,8 @@ def __init__(
 
     def _from_view(self, column_spec: ColumnSpec) -> None:
         self._painter_name = column_spec.name
-        if column_spec.parameters is not None:
-            self._painter_params = column_spec.parameters
-            self._custom_title = self._painter_params.get("column_title", None)
+        self._painter_params = column_spec.parameters
+        self._custom_title = self._painter_params.get("column_title", None)
 
         self._link_spec = column_spec.link_spec
 
@@ -398,14 +397,9 @@ def painter_parameters(self) -> PainterParameters | None:
         """The parameters configured in the view for this painter. In case the
         painter has params, it defaults to the valuespec default value and
         in case the painter has no params, it returns None."""
-        vs_painter_params = self.painter().parameters
-        if not vs_painter_params:
+        if not (vs_painter_params := self.painter().parameters):
             return None
-
-        if self._painter_params is None:
-            return vs_painter_params.default_value()
-
-        return self._painter_params
+        return self._painter_params if self._painter_params else vs_painter_params.default_value()
 
     def title(self, use_short: bool = True) -> str:
         if self._custom_title:

tests/unit/cmk/gui/plugins/views/test_painters.py

@@ -1719,7 +1719,7 @@ def _painter_name_spec(painter_ident):
         return painter_ident, {"uuid": "e13957f5-1b0b-43a7-a452-3bff7187542e"}
     if painter_ident == "svc_metrics_forecast":
         return painter_ident, {"uuid": "3c659189-29f3-411a-8456-6a07fdae4d51"}
-    return painter_ident, None
+    return painter_ident, {}
 
 
 def _set_expected_queries(painter_ident, live):