Simplified DynamicMap constructor
@@ -502,10 +502,6 @@ class DynamicMap(HoloMap):
stream.source = self
self.counter = 0
- if self.callback is None:
- raise Exception("A suitable callback must be "
- "declared to create a DynamicMap")
-
self.call_mode = self._validate_mode()
self.mode = 'bounded' if self.call_mode == 'key' else 'open'
