fixup! Add rrule p

Author: Marenz

src/frequenz/client/dispatch/recurrence.py

@@ -194,7 +194,13 @@ def prepare(self, start_time: datetime) -> rrule.rrule:
 
         Returns:
             The rrule object.
+
+        Raises:
+            ValueError: If the interval is 0.
         """
+        if self.interval == 0:
+            raise ValueError("Interval must be greater than 0")
+
         count, until = (None, None)
         if end := self.end_criteria:
             count = end.count