simplify config loading, allow missing config values
simplify config loading, allow missing config values

tlevine/rhizi,cben/rhizi,Rhizi/rhizi,ozFri/rhizi,Rhizi/rhizi,yuvadm/rhizi,cben/rhizi,Rhizi/rhizi,tlevine/rhizi,tlevine/rhizi,shlomif/rhizi,ozFri/rhizi,shlomif/rhizi,Rhizi/rhizi,tlevine/rhizi,yuvadm/rhizi,ozFri/rhizi,yuvadm/rhizi,cben/rhizi,ozFri/rhizi,yuvadm/rhizi,shlomif/rhizi,shlomif/rhizi,cben/rhizi