Handle [total|used]_space columns being nil
Handle [total|used]_space columns being nil

kbrock/manageiq,skateman/manageiq,kbrock/manageiq,mzazrivec/manageiq,NickLaMuro/manageiq,djberg96/manageiq,jvlcek/manageiq,jrafanie/manageiq,lpichler/manageiq,mzazrivec/manageiq,NickLaMuro/manageiq,mzazrivec/manageiq,jrafanie/manageiq,jvlcek/manageiq,kbrock/manageiq,agrare/manageiq,jrafanie/manageiq,kbrock/manageiq,d-m-u/manageiq,agrare/manageiq,skateman/manageiq,agrare/manageiq,lpichler/manageiq,lpichler/manageiq,jvlcek/manageiq,djberg96/manageiq,agrare/manageiq,NickLaMuro/manageiq,jvlcek/manageiq,mzazrivec/manageiq,jrafanie/manageiq,NickLaMuro/manageiq,skateman/manageiq,ManageIQ/manageiq,d-m-u/manageiq,lpichler/manageiq,chessbyte/manageiq,d-m-u/manageiq,djberg96/manageiq,skateman/manageiq,chessbyte/manageiq,chessbyte/manageiq,ManageIQ/manageiq,djberg96/manageiq,ManageIQ/manageiq,ManageIQ/manageiq,d-m-u/manageiq,chessbyte/manageiq