[libvirt] [PATCH 2/3]: Fix storage_conf parsing for empty <source>

[Chris Lalancette]

This patch fixes a minor bug in the storage_conf parsing.  Creating logical
volume pool XML without a source definition is a valid operation (for example,
if you just want to scan an already existing LVM group), but this bug was making
the parser reject that XML.  Bugfix from Dan Berrange, tested by me.

Signed-off-by: Chris Lalancette <clalance at redhat.com>
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