Fixes #32645 Trailing hyphen is removed in JHTML::_('select.options')
Merge pull request #3802 from Achal-Aggarwal/fix-32645

Fixes #32645 Trailing hyphen is removed in JHTML::_('select.options')
[fix][33899]Methods declared void must not return a value.
Close #3834
[imp] Update json2.js for Joomla Updater
Close #3848, close #3846
[imp] Change deprecated $app->getCfg() to $app->get() and some CS.
Close #3817, close #3815, close #3814
Codestyle
cs to trigger build
Save empty multi-value fields as empty array (instead of not at all).

Signed-off-by: Elijah Madden <elijah.madden@nikkoam.com>