Werk #13868: Fix missing graphs in notifications

Component	Notifications
Title	Fix missing graphs in notifications
Date	Mar 25, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0b4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p23 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Since version 2.0.0, quotes are allowed in service descriptions. If a notification was triggered for such service, the graphs were missing.

Furthermore, the mail subject showed "&quot" instead of quotes.

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