Bug 11401: QA followup

Bug 11401: QA followup

1) Be more careful when checking the NorwegianPatronDBEnable syspref.

Before:
if ( C4::Context->preference('NorwegianPatronDBEnable') == 1 ) {

After:
if ( C4::Context->preference('NorwegianPatronDBEnable') && C4::Context->preference('NorwegianPatronDBEnable') == 1 ) {

This should avoid complaints if the syspref is not initialized.

2) Fix some empty =head2 POD sections

3) Fix some indentation in patrons.pref, to make xt/yaml_valid.t happy

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
I couldn't find any regressions with adding, editing and deleting members.

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