chore: add if self.rate_limit_max_sleep

Author: temsocial

caldav/davclient.py

@@ -955,9 +955,8 @@ def request(
                 retry_after_seconds = self.rate_limit_default_sleep
                 if e.retry_after_seconds is not None:
                     retry_after_seconds = e.retry_after_seconds
-                retry_after_seconds = min(
-                    [retry_after_seconds or 0, self.rate_limit_max_sleep or 0]
-                )
+                if self.rate_limit_max_sleep:
+                    retry_after_seconds = min(retry_after_seconds or 0, self.rate_limit_max_sleep)
                 if retry_after_seconds <= 0:
                     raise e
                 time.sleep(retry_after_seconds)