[#247] fire a build_error transition without validations
[#247] fix RpmWorkerObserver transitions
[#247] small refactoring
Merge pull request #443 from abf/rosa-build:247-build_error
 #247 fix RpmWorkerObserver transitions
Fixed: adding of a key into set for fetching tasks in future
fix error in api - get a list build lists for a project
Merge branch 'master' of abf.rosalinux.ru:abf/rosa-build