fix(gismeteo): fix gismeteo parser

gallery/sketch/weather/parser.py

@@ -1,8 +1,12 @@
+from typing import Self
+
 from gallery.sketch.weather.model import WindDirection, WindDirectionDeg
 
 
 class ParseError(Exception):
-    pass
+    @classmethod
+    def invalid_date(cls, date_str: str) -> Self:
+        return cls("Invalid date string", date_str)
 
 
 WIND_DIRECTION_MAP: dict[str, WindDirection] = {