Werk #12489: Perfdata delivers whitespace

Component	Checks & agents
Title	Perfdata delivers whitespace
Date	Apr 21, 2021
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) 2.0.0p4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Some check-plugins delivered whitespace in their performance data for unknown values. This lead to failures in spearating the available metrics and bloating the web.log with exceptions. "Failed to parse perfdata"

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