Fallback lvs comparison to false.
Fallback lvs comparison to false.

If lvs invocation fails or doesn't return any output, then lv flags comparison to false.

Signed-off-by: Sidnei da Silva <ae5d79c37a36053cec725b76154099a786f2a8b4@canonical.com>
Signed-off-by: Serge Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>

thmo/lxc,bostjan/lxc,cjwatson/lxc,lazy404/lxc,armcc/lxc,GreatFruitOmsk/lxc,akshaykarle/lxc,federicobriata/lxc,LynxChaus/lxc,raspberrypython/lxc,QingweiPeterLan/cs188-lxc,bmoar/lxc,christiaan/lxc,GreatFruitOmsk/lxc,bostjan/lxc,caglar10ur/lxc,ioops/lxc,glensc/lxc,hfuCN/lxc,ioops/lxc,Pelagicore/lxc,raspberrypython/lxc,glensc/lxc,LynxChaus/lxc,Ponce/lxc,fwilson42/lxc,rldleblanc/lxc,ss1h2a3tw/lxc,aeris/lxc,Distrotech/lxc,ecarrara/lxc,weizhenwei/lxc,GreatFruitOmsk/lxc,bmoar/lxc,codebauss/lxc,rowhit/lxc,major/lxc,thmo/lxc,ksperis/lxc,aeris/lxc,caglar10ur/lxc,rowhit/lxc,sapun/lxc,ojkastl/lxc_Patches,fwilson42/lxc,ss1h2a3tw/lxc,bmoar/lxc,hfuCN/lxc,ojkastl/lxc_Patches,hkjolhede/lxc,terceiro/lxc,regit/lxc,ojkastl/lxc_Patches,ksperis/lxc,akshaykarle/lxc,Distrotech/lxc,bostjan/lxc,lazy404/lxc,hallyn/lxc,Ponce/lxc,codebauss/lxc,QingweiPeterLan/cs188-lxc,hkjolhede/lxc,efiop/lxc,weizhenwei/lxc,efiop/lxc,DarknessBeforeDawn/lxc,lisongmin/lxc,Ponce/lxc,armcc/lxc,christiaan/lxc,Pelagicore/lxc,fwilson42/lxc,yubo/lxc,codebauss/lxc,federicobriata/lxc,virajs/lxc,jirislaby/lxc,major/lxc,ojkastl/lxc_Patches,ysbnim/lxc,major/lxc,virajs/lxc,szaszg/lxc,lisongmin/lxc,terceiro/lxc,regit/lxc,federicobriata/lxc,glensc/lxc,rldleblanc/lxc,ksperis/lxc,ysbnim/lxc,szaszg/lxc,ss1h2a3tw/lxc,hallyn/lxc,virajs/lxc,yubo/lxc,ysbnim/lxc,caglar10ur/lxc,ecarrara/lxc,tych0/lxc,rowhit/lxc,LynxChaus/lxc,hallyn/lxc,akshaykarle/lxc,raspberrypython/lxc,jirislaby/lxc,QingweiPeterLan/cs188-lxc,efiop/lxc,christiaan/lxc,tych0/lxc,ioops/lxc,tych0/lxc,sapun/lxc,DarknessBeforeDawn/lxc,terceiro/lxc,rldleblanc/lxc,JohnPeacockMessageSystems/lxc,Pelagicore/lxc,Distrotech/lxc,aeris/lxc,armcc/lxc,cjwatson/lxc,regit/lxc,sapun/lxc,hfuCN/lxc,lisongmin/lxc,szaszg/lxc,cjwatson/lxc,yubo/lxc,DarknessBeforeDawn/lxc,lazy404/lxc,thmo/lxc,JohnPeacockMessageSystems/lxc,hkjolhede/lxc,ecarrara/lxc,JohnPeacockMessageSystems/lxc,jirislaby/lxc,weizhenwei/lxc