Werk #4082: Icon selector: Fixed exception in case non images are saved in icon folder

Component	Setup
Title	Icon selector: Fixed exception in case non images are saved in icon folder
Date	Dec 1, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.2.8p15 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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