Werk #4050: Fixed snapin-refresh error handling.

Component	User interface
Title	Fixed snapin-refresh error handling.
Date	Feb 15, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0b2 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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