Fixed saving / loading render status states

lib/render_workers/render_worker.py

@@ -20,6 +20,7 @@ class RenderStatus(Enum):
     CANCELLED = "cancelled"
     ERROR = "error"
     SCHEDULED = "scheduled"
+    UNDEFINED = "undefined"
 
 
 def string_to_status(string):
@@ -244,6 +245,7 @@ class BaseRenderWorker(object):
         worker_data = self.__dict__.copy()
         worker_data['percent_complete'] = self.percent_complete()
         worker_data['time_elapsed'] = self.time_elapsed()
+        worker_data['status'] = self.status.value
         keys_to_remove = ['thread', 'process']  # remove unwanted keys from dict
         for key in worker_data.keys():
             if key.startswith('_'):