Checkmk Werk 13022: Fix adding temperature graph to graph collections

ID: 13022 Title: Fix adding temperature graph to graph collections Component: Multisite Level: 1 Class: Bug fix Version: 2.1.0i1 Before this werk it was not possible to add a "Temperature Zone N" graph to a graph collection. There was no error message visible, it was simply not added to the collection. The function used to receive the graph definition was only expecting ascii characters, although the graph definition contained a degree symbol. Now a unicode compatible function is used to receive the graph definition.