parallels: don't override error message when XML parsing fails
parallels: don't override error message when XML parsing fails

The virDomainDefParseString method will report a suitable error
on parsing fail, so don't replace that.

agx/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,VenkatDatta/libvirt,olafhering/libvirt,nertpinx/libvirt,datto/libvirt,fabianfreyer/libvirt,rlaager/libvirt,libvirt/libvirt,elmarco/libvirt,jfehlig/libvirt,shugaoye/libvirt,zippy2/libvirt,olafhering/libvirt,nertpinx/libvirt,elmarco/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,datto/libvirt,andreabolognani/libvirt,eskultety/libvirt,libvirt/libvirt,olafhering/libvirt,zippy2/libvirt,shugaoye/libvirt,taget/libvirt,shugaoye/libvirt,crobinso/libvirt,eskultety/libvirt,fabianfreyer/libvirt,elmarco/libvirt,taget/libvirt,VenkatDatta/libvirt,andreabolognani/libvirt,nertpinx/libvirt,jardasgit/libvirt,rlaager/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,taget/libvirt,taget/libvirt,fabianfreyer/libvirt,libvirt/libvirt,rlaager/libvirt,eskultety/libvirt,jardasgit/libvirt,jardasgit/libvirt,datto/libvirt,zippy2/libvirt,crobinso/libvirt,agx/libvirt,zippy2/libvirt,taget/libvirt,andreabolognani/libvirt,shugaoye/libvirt,olafhering/libvirt,datto/libvirt,agx/libvirt,elmarco/libvirt,datto/libvirt,shugaoye/libvirt,agx/libvirt,crobinso/libvirt,libvirt/libvirt,rlaager/libvirt,agx/libvirt,andreabolognani/libvirt,eskultety/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,eskultety/libvirt,crobinso/libvirt,elmarco/libvirt,VenkatDatta/libvirt,rlaager/libvirt,nertpinx/libvirt,jfehlig/libvirt