fix Celery's tasks traceback display in admin-interface
fix Celery's tasks traceback display in admin-interface

wevoice/wesub,eloquence/unisubs,ofer43211/unisubs,ReachingOut/unisubs,ReachingOut/unisubs,eloquence/unisubs,ujdhesa/unisubs,pculture/unisubs,norayr/unisubs,eloquence/unisubs,ReachingOut/unisubs,norayr/unisubs,ujdhesa/unisubs,wevoice/wesub,ofer43211/unisubs,ujdhesa/unisubs,eloquence/unisubs,norayr/unisubs,wevoice/wesub,ofer43211/unisubs,ujdhesa/unisubs,pculture/unisubs,pculture/unisubs,wevoice/wesub,ReachingOut/unisubs,norayr/unisubs,ofer43211/unisubs,pculture/unisubs