Bug 14769: (Follow-up) Let blinddetail look at indicator values

Bug 14769: (Follow-up) Let blinddetail look at indicator values

If the indicators are not controlled, blinddetail should not overwrite
what the user already entered. Very strictly seen, we could say that it
is outside the scope. But it is strongly related.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Tested with 100 and 600 in the cataloging editor.
For 100 the second indicator should not be overwritten. For 600 it should.
Also tested "ind2:" which should blank ind2.

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>