Werk #8868: Fix broken graph loading image

Component	User interface
Title	Fix broken graph loading image
Date	Aug 21, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b7 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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