Werk #4388: Views: Fixed exception with host tag columns which tag has been deleted

KomponenteGUI
TitelViews: Fixed exception with host tag columns which tag has been deleted
Datum2017-02-20 15:27:41
Check_MK EditionCheck_MK Raw Edition (CRE)
Check_MK Version1.4.0b3,1.5.0i1,1.2.8p18
LevelTrivial Change
KlasseBug Fix
KompatibilitätKompatibel - benötigt kein manuelles Eingreifen

This fixes a possible exception "TypeError ('NoneType' object is unsubscriptable)".