set List<> collection for reopened pipe without coating
Merge branch 'master' into sidorov_CrashEditingCoating
creating new List<Domain.Entity.Mill.Weld> for empty Weld collection
at reopen pipe without welds
add comments for solved problem
Merge pull request #423 from olga-jane/sidorov_CrashEditingCoating

crash editing coating
Merge remote-tracking branch 'origin/master' into SeveralCertificatesUI