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

Component	User interface
Title	Views: Fixed exception with host tag columns which tag has been deleted
Date	Feb 20, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.4.0b3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.2.8p18 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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

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