Werk #12130: Raw Edition: Fix graph in HTML notifications

Component	Notifications
Title	Raw Edition: Fix graph in HTML notifications
Date	Feb 15, 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) 2.0.0b7 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The HTML mail notifications of the Raw Edition were not containing graph images anymore.

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