Feature #1852: Allow a cardinality of 0
Feature #1852: Allow a cardinality of 0

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