Werk #8885: Fix report PDF opening since #7990 (1.6.0b5) in chrome

Component	Reporting & availability
Title	Fix report PDF opening since #7990 (1.6.0b5) in chrome
Date	Sep 2, 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) 1.6.0b8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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