conf: Don't output <cpu> tag if it contains no information.
The tag is already marked as optional in the schema, so no changes are needed there. RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=1202606
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The tag is already marked as optional in the schema, so no changes are needed there. RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=1202606