Don't allow NULL as email subject

Pre-release

Pre-release

rultor released this 10 Jul 15:20

· 83 commits to master since this release

See #54, release log:

07edb07 by @yegor256: #54 jcabi-parent 1.23
89a197d by @yegor256: #54 null checks
8d3fa62 by @yegor256: email updated
67ee623: updated merge/commanders list
a555446: TEAM.md page updated

Released by Rultor 1.64.1, see build log

Assets 2