Update tasks.rb
Update tasks.rb

Fix message typo when WORKERS are empty.
jondot/sneakers,xiangzhuyuan/sneakers,michaelbaudino/sneakers,jcsmith1859/sneakers,duduribeiro/sneakers,jondot/sneakers,tsagadar/sneakers,eToThePiIPower/sneakers,YaronWittenstein/sneakers,reevoo/sneakers,replaygaming/sneakers,adaptiv-io/sneakers,pomnikita/sneakers,veetow/sneakers,reevoo/sneakers,herenow/sneakers,pomnikita/sneakers,pomnikita/sneakers,reevoo/sneakers,rud/sneakers