efdc0ca frontend: notify all not-deleted chroots

1 file Authored by praiskup 3 years ago, Committed by praiskup 3 years ago,
    frontend: notify all not-deleted chroots
    
    The 'not_(models.CoprChroot.deleted)' variant did not cover NULL
    fields, 'models.CoprChroot.deleted.isnot(True)' is proper variant.
    
    Relates: #1724