Werk #11740: ceph_status_mgrs: fix crash on KeyError(epoch)

Component	Checks & agents
Title	ceph_status_mgrs: fix crash on KeyError(epoch)
Date	Dec 22, 2020
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 2.0.0b4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p20 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The Ceph Status MGRs check crashed on a missing key: KeyError(epoch). This crash occurs when there is no epoch data available. An UNKNOWN status is now shown when this data is not found.

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