fix: has_events_marked checks actual events not just key existence

Author: chiara-doist

bitmapist/__init__.py

@@ -389,7 +389,7 @@ class MixinEventsMisc:
 
     def has_events_marked(self):
         cli = get_redis(self.system)
-        return bool(cli.exists(self.redis_key))
+        return cli.bitcount(self.redis_key) > 0
 
     def delete(self):
         cli = get_redis(self.system)

bitmapist/cohort/__init__.py

@@ -304,9 +304,7 @@ def timedelta_inc(delta: int) -> Union[relativedelta, timedelta]:
                 select2b_events = fn_get_events(select2b, delta_now, system)
                 select2_events = BitOpAnd(system, select2_events, select2b_events)
 
-            # Check if there are actually any events (not just if the key exists)
-            # BitOpAnd creates a key even when result is 0, so we must check the count
-            if len(select2_events) == 0:
+            if not select2_events.has_events_marked():
                 result.append("")
                 continue