Werk #11658: Add icon for custom topics on update to 2.0

Component User interface
Title Add icon for custom topics on update to 2.0
Date Nov 12, 2020
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 2.0.0b1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

After updating to 2.0.0i1, custom topics that already existed in version 1.6 had no icon set.

Such topics will now get a standard icon while the config update.

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