When no jUnit suites are requested, don't merge them
When no jUnit suites are requested, don't merge them

The behavior today is to try to merge suites and fail to dereference
the `$TEST_REPORT_DIR`. We should just skip this when no suites are
expected.

Signed-off-by: Steve Kuznetsov <a7da0fca91d9933d2725d731a48cabdc9e8ffd7a@redhat.com>

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