change batch_size disabled 0 to 1 (#417)

Author: andrewleap-optimizely

optimizely/odp/odp_event_manager.py

@@ -66,7 +66,7 @@ def __init__(
         self.api_host: Optional[str] = None
 
         self.event_queue: Queue[OdpEvent | Signal] = Queue(OdpEventManagerConfig.DEFAULT_QUEUE_CAPACITY)
-        self.batch_size = 0 if flush_interval == 0 else OdpEventManagerConfig.DEFAULT_BATCH_SIZE
+        self.batch_size = 1 if flush_interval == 0 else OdpEventManagerConfig.DEFAULT_BATCH_SIZE
 
         self.flush_interval = OdpEventManagerConfig.DEFAULT_FLUSH_INTERVAL if flush_interval is None \
             else flush_interval