Bug 12622: Fix export report as ods

Bug 12622: Fix export report as ods

Bug 11679 introduces an ods export for reports.

It looks quite buggy:
1/ You get a Perl error if the report has no results
2/ The ods file contains 1 lines less than the total results.

Test plan:
After applying this patch, try to export a report which has no results
and verify you get an ods file with headers only.
Try to export a report which has a least 1 result and verify the
generated ods has the right number of lines.

Signed-off-by: Robert Higgins <robert.higgins@catalyst.net.nz>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Fixes the reported problem, passes all tests and QA script.
Added the sign-off line for Robert.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>