Werk #996: apc_symmetra_test: Handle unknown date of last self test as intended

Component	Checks & agents
Title	apc_symmetra_test: Handle unknown date of last self test as intended
Date	Jun 30, 2014
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.5i5 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

If the date of last self test is reported to be unknown, up to now the check broke. Now unknow status is handled as intended.

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