If our caption set's last caption does not have an end time, set it to either a) the duration of the video or b) the start time of the caption + 4 seconds.
If our caption set's last caption does not have an end time, set it to either a) the duration of the video or b) the start time of the caption + 4 seconds.

For: https://unisubs.sifterapp.com/projects/12298/issues/707358/comments

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