OroKernel collectBundles fix when bundles.yml empty
OroKernel collectBundles fix when bundles.yml empty

When bundles.yml file empty or has no 'bundles:' node - need to filter it correctly. Just ignore such files content.
geoffroycochard/platform,morontt/platform,northdakota/platform,ramunasd/platform,ramunasd/platform,northdakota/platform,geoffroycochard/platform,2ndkauboy/platform,morontt/platform,hugeval/platform,ramunasd/platform,trustify/oroplatform,trustify/oroplatform,orocrm/platform,morontt/platform,Djamy/platform,northdakota/platform,orocrm/platform,hugeval/platform,geoffroycochard/platform,2ndkauboy/platform,Djamy/platform,orocrm/platform,Djamy/platform,hugeval/platform,trustify/oroplatform,2ndkauboy/platform