Handle sysfs size if it is missing (#1265090)
Handle sysfs size if it is missing (#1265090)

sysfs paths may, for whatever reason, not exist. Return '0' for int()
instead of None if this is the case.

Resolves: rhbz#1265090
(cherry picked from commit 7630522c6105086ff5f09121b55de061a527e856)

jkonecny12/blivet,rvykydal/blivet,vojtechtrefny/blivet,vpodzime/blivet,vojtechtrefny/blivet,AdamWill/blivet,vpodzime/blivet,jkonecny12/blivet,rhinstaller/blivet,rhinstaller/blivet,rvykydal/blivet,AdamWill/blivet