Checkmk Werk 10556: Fix adding host/service label filters to views

ID: 10556 Title: Fix adding host/service label filters to views Component: Multisite Level: 1 Class: Bug fix Version: 1.7.0i1 When trying to add host or service label filters to views, this resulted in an error message like this when displaying the filter again after saving the view: C+: Failed to parse labels: No JSON object could be decoded C-: