Fix crash in one_vmm_exec.rb
Fix crash in one_vmm_exec.rb

(cherry picked from commit 7a3fcc1dce58d2c9a2126acf4cda81e7a2b04d1e)

OpenNebula/one,goberle/one,OpenNebula/one,atodorov-storpool/one,juanmont/one,goberle/one,atodorov-storpool/one,baby-gnu/one,atodorov-storpool/one,atodorov-storpool/one,abelCoronado93/one,abelCoronado93/one,unistra/one,baby-gnu/one,abelCoronado93/one,abelCoronado93/one,unistra/one,goberle/one,juanmont/one,atodorov-storpool/one,unistra/one,abelCoronado93/one,goberle/one,juanmont/one,OpenNebula/one,abelCoronado93/one,atodorov-storpool/one,OpenNebula/one,goberle/one,unistra/one,juanmont/one,unistra/one,baby-gnu/one,OpenNebula/one,atodorov-storpool/one,juanmont/one,unistra/one,goberle/one,abelCoronado93/one,OpenNebula/one,goberle/one,atodorov-storpool/one,OpenNebula/one,unistra/one,juanmont/one,baby-gnu/one,baby-gnu/one,baby-gnu/one,juanmont/one,goberle/one,unistra/one,baby-gnu/one,juanmont/one,juanmont/one,OpenNebula/one,abelCoronado93/one,baby-gnu/one,OpenNebula/one,atodorov-storpool/one