Werk #12062: Fix rendering of report snapin if icon is missing

Component	User interface
Title	Fix rendering of report snapin if icon is missing
Date	Feb 10, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0b7 Checkmk Enterprise (CEE), Checkmk MSP (CME)

If an exsiting report had no icon, the rendering of the gui was broken. Such reports will now get a default icon.

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