Intended to cleanup qweb xmls: - remove blank (empty) nodes and/or nodes with whitespace text - fix indentation - remove indentation (needed for some xml signatures) closes odoo/odoo#91006 X-original-commit: b7d7adb4f5a9873350511c227d5fbf54c8f38ce8 Signed-off-by: William André (wan) <wan@odoo.com>