Fixed NPE in listVirtualMachines command - when search for ROOT volume's storagePool type, assume that corresponding storagePool might be removed.
Fixed NPE in listVirtualMachines command - when search for ROOT volume's storagePool type, assume that corresponding storagePool might be removed.

mufaddalq/cloudstack-datera-driver,GabrielBrascher/cloudstack,cinderella/incubator-cloudstack,GabrielBrascher/cloudstack,cinderella/incubator-cloudstack,GabrielBrascher/cloudstack,wido/cloudstack,wido/cloudstack,mufaddalq/cloudstack-datera-driver,DaanHoogland/cloudstack,argv0/cloudstack,cinderella/incubator-cloudstack,resmo/cloudstack,jcshen007/cloudstack,GabrielBrascher/cloudstack,cinderella/incubator-cloudstack,GabrielBrascher/cloudstack,jcshen007/cloudstack,argv0/cloudstack,resmo/cloudstack,mufaddalq/cloudstack-datera-driver,jcshen007/cloudstack,resmo/cloudstack,GabrielBrascher/cloudstack,wido/cloudstack,wido/cloudstack,argv0/cloudstack,wido/cloudstack,resmo/cloudstack,jcshen007/cloudstack,resmo/cloudstack,resmo/cloudstack,argv0/cloudstack,argv0/cloudstack,jcshen007/cloudstack,mufaddalq/cloudstack-datera-driver,wido/cloudstack,DaanHoogland/cloudstack,jcshen007/cloudstack,resmo/cloudstack,GabrielBrascher/cloudstack,DaanHoogland/cloudstack,DaanHoogland/cloudstack,DaanHoogland/cloudstack,mufaddalq/cloudstack-datera-driver,argv0/cloudstack,DaanHoogland/cloudstack,wido/cloudstack,DaanHoogland/cloudstack,jcshen007/cloudstack,mufaddalq/cloudstack-datera-driver,cinderella/incubator-cloudstack