The current code in linuxscsi.py handles the case where there is one
error in the output of "multipath -l", but when there are multiple
errors there is an empty line between error messages. The code filters
out the error lines but not the empty lines, and so it then looks for
the device name in an empty line and so it fails to parse it.
Closes-Bug: #1778468
Change-Id: I7a5bdf285a74e045ce7d11df5e8c0921d3447106
9b729ef0e7