Make clean_dummy_task a noop when dummy_app doesn't exist.
Make clean_dummy_task a noop when dummy_app doesn't exist.

simi/refinerycms,KingLemuel/refinerycms,hoopla-software/refinerycms,trevornez/refinerycms,mkaplan9/refinerycms,anitagraham/refinerycms,Eric-Guo/refinerycms,chrise86/refinerycms,mabras/refinerycms,SmartMedia/refinerycms-with-custom-icons,hoopla-software/refinerycms,kappiah/refinerycms,Retimont/refinerycms,refinery/refinerycms,aguzubiaga/refinerycms,Retimont/refinerycms,sideci-sample/sideci-sample-refinerycms,bryanmtl/g-refinerycms,stefanspicer/refinerycms,KingLemuel/refinerycms,KingLemuel/refinerycms,simi/refinerycms,stefanspicer/refinerycms,bricesanchez/refinerycms,LytayTOUCH/refinerycms,mobilityhouse/refinerycms,anitagraham/refinerycms,mkaplan9/refinerycms,Eric-Guo/refinerycms,hoopla-software/refinerycms,chrise86/refinerycms,aguzubiaga/refinerycms,gwagener/refinerycms,kappiah/refinerycms,mabras/refinerycms,sideci-sample/sideci-sample-refinerycms,kelkoo-services/refinerycms,mojarra/myrefinerycms,johanb/refinerycms,mlinfoot/refinerycms,trevornez/refinerycms,simi/refinerycms,kappiah/refinerycms,trevornez/refinerycms,johanb/refinerycms,kelkoo-services/refinerycms,louim/refinerycms,refinery/refinerycms,gwagener/refinerycms,mabras/refinerycms,chrise86/refinerycms,bryanmtl/g-refinerycms,mlinfoot/refinerycms,johanb/refinerycms,anitagraham/refinerycms,LytayTOUCH/refinerycms,LytayTOUCH/refinerycms,mkaplan9/refinerycms,SmartMedia/refinerycms-with-custom-icons,Eric-Guo/refinerycms,simi/refinerycms,gwagener/refinerycms,refinery/refinerycms,mlinfoot/refinerycms,stefanspicer/refinerycms,aguzubiaga/refinerycms,mojarra/myrefinerycms,bricesanchez/refinerycms,mobilityhouse/refinerycms,louim/refinerycms,Retimont/refinerycms