Werk #2743: Fixed handling of column types in "GET columns"

Component	Livestatus
Title	Fixed handling of column types in "GET columns"
Date	Nov 4, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Under rare circumstances the core could crash during the processing of a columns query.

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