Fixed NullPointer when creating checklist from empty text without hint
activated.
Pressing "next" will simply close the keyboard only if is pressed from
empty hint item.
If line is empty a newline will not be created but the focus will be
moved on bottom
If line is empty a newline will not be created but the focus will be
moved on bottom.
This must happen also if an empty line is already present under the
actual one.