Werk #13668: jenkins_queue: Fix n/a metrics in case of missing data

Component	Core & setup
Title	jenkins_queue: Fix n/a metrics in case of missing data
Date	Feb 14, 2022
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) 2.0.0p21 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

If no blocked, pending and stuck tasks were retrieved from jenkins, the metrics showed "n/a" in graphs instead of value 0.

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