* morituri/common/task.py:

* morituri/image/cue.py:
	  Add logCategory.
	* morituri/image/image.py:
	  If subtasks had an exception, retrigger the exception and stop.

morituri/common/task.py

@@ -52,6 +52,8 @@ class Task(object, log.Loggable):
     @ivar  exception:   set if an exception happened during the task
                         execution.  Will be raised through run() at the end.
     """
+    logCategory = 'Task'
+
     description = 'I am doing something.'
 
     progress = 0.0