Fixes bug #527: Users with empty names/passwords
Fixes bug #527: Users with empty names/passwords

Sunstone will warn the user that both fields need to be filled in.

mattthias/one,juanmont/one,hsanjuan/one,Terradue/one,dberzano/opennebula-torino,baby-gnu/one,goberle/one,atodorov-storpool/one,ggalancs/one,OpenNebula/one,OpenNebula/one,mattthias/one,spirit03/one,hsanjuan/one,ggalancs/one,abelCoronado93/one,fasrc/one,unistra/one,ohamada/one,cloudweavers/one,abelCoronado93/one,hsanjuan/one,unistra/one,cloudweavers/one,spirit03/one,alvarosimon/one,spirit03/one,fasrc/one,spirit03/one,hsanjuan/one,fasrc/one,abelCoronado93/one,unistra/one,baby-gnu/one,unistra/one,mattthias/one,baby-gnu/one,ohamada/one,juanmont/one,dberzano/opennebula-torino,tuxmea/one,spirit03/one,abelCoronado93/one,tuxmea/one,hsanjuan/one,atodorov-storpool/one,goberle/one,hsanjuan/one,mattthias/one,atodorov-storpool/one,baby-gnu/one,tuxmea/one,fasrc/one,tuxmea/one,Terradue/one,goberle/one,tuxmea/one,goberle/one,fasrc/one,ohamada/one,abelCoronado93/one,juanmont/one,atodorov-storpool/one,alvarosimon/one,Terradue/one,juanmont/one,dberzano/opennebula-torino,atodorov-storpool/one,alvarosimon/one,spirit03/one,cloudweavers/one,spirit03/one,dberzano/opennebula-torino,atodorov-storpool/one,mattthias/one,OpenNebula/one,OpenNebula/one,OpenNebula/one,tuxmea/one,alvarosimon/one,fasrc/one,alvarosimon/one,cloudweavers/one,goberle/one,unistra/one,ggalancs/one,juanmont/one,unistra/one,ggalancs/one,juanmont/one,ohamada/one,alvarosimon/one,fasrc/one,baby-gnu/one,OpenNebula/one,baby-gnu/one,goberle/one,ggalancs/one,alvarosimon/one,mattthias/one,OpenNebula/one,juanmont/one,ggalancs/one,Terradue/one,spirit03/one,baby-gnu/one,cloudweavers/one,OpenNebula/one,atodorov-storpool/one,hsanjuan/one,unistra/one,Terradue/one,cloudweavers/one,baby-gnu/one,ggalancs/one,mattthias/one,abelCoronado93/one,Terradue/one,cloudweavers/one,abelCoronado93/one,tuxmea/one,mattthias/one,dberzano/opennebula-torino,Terradue/one,Terradue/one,abelCoronado93/one,dberzano/opennebula-torino,ggalancs/one,OpenNebula/one,juanmont/one,hsanjuan/one,alvarosimon/one,goberle/one,tuxmea/one,cloudweavers/one,juanmont/one,fasrc/one,ohamada/one,goberle/one,ohamada/one,ohamada/one,ohamada/one,atodorov-storpool/one,atodorov-storpool/one,dberzano/opennebula-torino,unistra/one