Added test case for bug 6151.
Added test case for bug 6151.

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