Checkmk Werk 10176: View group filters showed equal named groups multiple times

ID: 10176 Title: View group filters showed equal named groups multiple times Component: Multisite Level: 1 Class: Bug fix Version: 1.7.0i1 In distributed setups the view filters "Several host groups" and "Several service groups" were showing equal named groups once per site instead of deduplicating them as inteded. This was a 1.6 regression.