added undef of cache if GroupMemberAdd() has done changes
added undef of cache if GroupMemberAdd() has done changes

moritz/otrs,thorsteneckel/otrs,rudy500/otrs,mbeijen/otrs-1,moritz/otrs,oiami/otrs,rudy500/otrs,s7design/otrs,s7design/otrs,thorsteneckel/otrs,s7design/otrs,eliasp/otrs,rudy500/otrs,StCyr/otrs,brandonshults01/otrs,capeit-tto/otrs,noritnk/otrs,muehlbauer/otrs,moritz/otrs,linearregression/otrs,StCyr/otrs,linearregression/otrs,oiami/otrs,balazj/otrs,mburggraf/otrs,brandonshults01/otrs,nilei/otrs,eliasp/otrs,nilei/otrs,crythias/otrs,mbeijen/otrs-1,muehlbauer/otrs,nilei/otrs,thorsteneckel/otrs,balazj/otrs,eliasp/otrs,MBRG/otrs,vlascoder/otrs,vlascoder/otrs,MBRG/otrs,brandonshults01/otrs,crythias/otrs,eliasp/otrs,muehlbauer/otrs,brandonshults01/otrs,nilei/otrs,s7design/otrs,StCyr/otrs,xhoy/otrs,xhoy/otrs,s7design/otrs,xhoy/otrs,rudy500/otrs,balazj/otrs,mburggraf/otrs,PortgasDAce/otrs,crythias/otrs,noritnk/otrs,crythias/otrs,MBRG/otrs,balazj/otrs,mburggraf/otrs,rudy500/otrs,StCyr/otrs,capeit-tto/otrs,oiami/otrs,vlascoder/otrs,moritz/otrs,xhoy/otrs,PortgasDAce/otrs,mburggraf/otrs,thorsteneckel/otrs,balazj/otrs,linearregression/otrs,moritz/otrs,capeit-tto/otrs,nilei/otrs,noritnk/otrs,StCyr/otrs,muehlbauer/otrs,oiami/otrs,xhoy/otrs,oiami/otrs,PortgasDAce/otrs,muehlbauer/otrs,linearregression/otrs,MBRG/otrs,crythias/otrs,mbeijen/otrs-1,MBRG/otrs,PortgasDAce/otrs,brandonshults01/otrs,linearregression/otrs,mburggraf/otrs,PortgasDAce/otrs,eliasp/otrs,thorsteneckel/otrs