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 Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8p15 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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