Improve WS command validate_config (#118864)

Co-authored-by: epenet <6771947+epenet@users.noreply.github.com>
Co-authored-by: Robert Resch <robert@resch.dev>

homeassistant/components/websocket_api/commands.py

@@ -862,7 +862,10 @@ async def handle_validate_config(
 
         try:
             await validator(hass, schema(msg[key]))
-        except vol.Invalid as err:
+        except (
+            vol.Invalid,
+            HomeAssistantError,
+        ) as err:
             result[key] = {"valid": False, "error": str(err)}
         else:
             result[key] = {"valid": True, "error": None}