When the selection only contains empty lines, no text nodes are selected. `applyInlineStyle` however counted on text nodes being selected, resulting in a traceback. task-2740204 closes odoo/odoo#85059 X-original-commit: ee6c71a3bcd6ec927acbe4eaf4c21acb28396e87 Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>