Werk #3316: Fix validation of empty or missing file uploads (such as in Bulk host import)

Component	Setup
Title	Fix validation of empty or missing file uploads (such as in Bulk host import)
Date	Mar 21, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.2.8b8 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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