Bug 29049: (follow-up) Reduce number of line returns in page

Bug 29049: (follow-up) Reduce number of line returns in page

While moving the dropdown to a block, I noticed the page size was very large when there are many holds

This patch chomps a large amoutn of whitespace, from the block and elsewhere and drecreased the paeg from about 400k lines to 25k lines for a record with ~200 holds

To test:
1 - Apply previous patch
2 - Load holds tab for a biblio
3 - Save the page as html from your browser, note the size of the file
4 - Apply patch this
5 - Reload and repeat
6 - Note the size is much smaller

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
Signed-off-by: Joonas Kylmälä <joonas.kylmala@iki.fi>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>