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 Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0b7 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p21 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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

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