Minor enhancement on business output processing.

This adds more details on business rules having an Xof: syntax. With the
previous patch alone, if an Xof: business rule had an OK state, but one
of its childs had a non OK state, the information was not displayed.
This patch adds this information in the output.
Merge pull request #976 from geektophe/bp_rule_output_xof

Minor enhancement on business output processing.