Fix migration published_on parameter check
Fix migration published_on parameter check

jorol/StoryMapJS,1modm/StoryMapJS,cr3ative/StoryMapJS,cr3ative/StoryMapJS,1modm/StoryMapJS,makinacorpus/StoryMapJS,wangjun/StoryMapJS,BenHeubl/StoryMapJS,makinacorpus/StoryMapJS,wangjun/StoryMapJS,makinacorpus/StoryMapJS,BenHeubl/StoryMapJS,BenHeubl/StoryMapJS,jorol/StoryMapJS,cr3ative/StoryMapJS,jorol/StoryMapJS,jorol/StoryMapJS,wangjun/StoryMapJS,cr3ative/StoryMapJS,1modm/StoryMapJS,1modm/StoryMapJS,wangjun/StoryMapJS,BenHeubl/StoryMapJS