Werk #14471: Fix possible AttributeError on report rendering

Component

Reporting & availability

Title

Fix possible AttributeError on report rendering

Date

Aug 17, 2022

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.2.0b1	Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.1.0p10	Checkmk Enterprise (CEE), Checkmk MSP (CME)
2.0.0p28	Checkmk Enterprise (CEE), Checkmk MSP (CME)

If an availability table with annotation using "Reclassify downtime of this period regard as scheduled downtime" was added to a report, the rendering of the report failed with an error like "AttributeError: 'NoneType' object has no attribute 'read'".

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