Werk #13088: Handle old syslog messages without a tag.

Component	Event Console
Title	Handle old syslog messages without a tag.
Date	Oct 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) 2.0.0p13 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The event console could not parse a RFC-3164-style message where the CONTENT did not start with a TAG. The TAG is specified as optional, so we handle that case now, too.

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