Werk #12746: Fix possible UnicodeDecodeError in reports

Component	Reporting & availability
Title	Fix possible UnicodeDecodeError in reports
Date	Apr 21, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p4 Checkmk Enterprise (CEE), Checkmk MSP (CME)

If images where used in reports, e.g. for icons like "Log: event icon" in scheduled downtimes, an UnicodeDecodeError could occur.

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