TCP: Don't reassemble out of order if the segments list doesn't exist
If the OOO TCP preference is set, but the tcp analysis struct doesn't have the OOO segments, because the preference wasn't set when it was created, don't try to reassemble out of order.
This is an indication of dissecting in an inconsistent state, with changed preferences but old conversation data created with the old preference settings. Hopefully it's just a temporary dissection from a GUI refresh.
Related to #19079 (closed)