Werk #11353: k8s_daemon_pods: Handle null value

Component	Checks & agents
Title	k8s_daemon_pods: Handle null value
Date	Feb 8, 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) 2.0.0b7 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0p21 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

number_available and number_unavailable may be None, so handle them correctly.

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