Werk #11519: Support Diagnostics: Fix validation of diagnostics tar file name if downloading from remote site

Component	User interface
Title	Support Diagnostics: Fix validation of diagnostics tar file name if downloading from remote site
Date	Dec 7, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0b2 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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