Werk #8790: Don't crash if no image/file is selected in an upload dialog

Component	User interface
Title	Don't crash if no image/file is selected in an upload dialog
Date	Aug 28, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0b8 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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