partial fireworks revert

fireworks/core/firework.py

@@ -153,13 +153,13 @@ def __init__(
                 not only to direct children, but to all dependent FireWorks
                 down to the Workflow's leaves.
         """
-        mod_spec = mod_spec or []
-        additions = additions or []
-        detours = detours or []
+        mod_spec = mod_spec if mod_spec is not None else []
+        additions = additions if additions is not None else []
+        detours = detours if detours is not None else []
 
-        self.stored_data = stored_data or {}
+        self.stored_data = stored_data if stored_data else {}
         self.exit = exit
-        self.update_spec = update_spec or {}
+        self.update_spec = update_spec if update_spec else {}
         self.mod_spec = mod_spec if isinstance(mod_spec, (list, tuple)) else [mod_spec]
         self.additions = additions if isinstance(additions, (list, tuple)) else [additions]
         self.detours = detours if isinstance(detours, (list, tuple)) else [detours]
@@ -267,13 +267,13 @@ def __init__(
             NEGATIVE_FWID_CTR -= 1
             self.fw_id = NEGATIVE_FWID_CTR
 
-        self.launches = launches or []
-        self.archived_launches = archived_launches or []
+        self.launches = launches if launches else []
+        self.archived_launches = archived_launches if archived_launches else []
         self.created_on = created_on or datetime.utcnow()
         self.updated_on = updated_on or datetime.utcnow()
 
         parents = [parents] if isinstance(parents, Firework) else parents
-        self.parents = parents or []
+        self.parents = parents if parents else []
 
         self._state = state
 
@@ -476,9 +476,9 @@ def __init__(
         self.fworker = fworker or FWorker()
         self.host = host or get_my_host()
         self.ip = ip or get_my_ip()
-        self.trackers = trackers or []
-        self.action = action or None
-        self.state_history = state_history or []
+        self.trackers = trackers if trackers else []
+        self.action = action if action else None
+        self.state_history = state_history if state_history else []
         self.state = state
         self.launch_id = launch_id
         self.fw_id = fw_id