21.12.7 (2020-06-19) Bug Fixes datasource: return null instead of empty releases (508bd47) gitlab-tags: use URL.resolve (c8cc375) Code Refactoring util/exec use getPkgReleases (735f6a5) Tests docker datasource refactor (460b0a8) refactor lookup id use (cf06b69) travis mock getPkgReleases (df1aa26)