Improve unknown worker handling
Improve unknown worker handling

alexmojaki/flower,marrybird/flower,pj/flower,pygeek/flower,marrybird/flower,ucb-bar/bar-crawl-web,barseghyanartur/flower,getupcloud/flower,getupcloud/flower,asmodehn/flower,Lingling7/flower,lucius-feng/flower,raphaelmerx/flower,marrybird/flower,Lingling7/flower,ChinaQuants/flower,tellapart/flower,Lingling7/flower,alexmojaki/flower,pj/flower,barseghyanartur/flower,tellapart/flower,pygeek/flower,allengaller/flower,ucb-bar/bar-crawl-web,raphaelmerx/flower,getupcloud/flower,ChinaQuants/flower,pj/flower,ucb-bar/bar-crawl-web,tellapart/flower,asmodehn/flower,ChinaQuants/flower,jzhou77/flower,asmodehn/flower,jzhou77/flower,lucius-feng/flower,allengaller/flower,jzhou77/flower,pygeek/flower,raphaelmerx/flower,alexmojaki/flower,barseghyanartur/flower,allengaller/flower,lucius-feng/flower