[Cog Serv] catch empty caption case

[PatrickFarley]

Purpose

• Handle the case of no returned captions (previously caused an exception)

Does this introduce a breaking change?

[ ] Yes
[X ] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ X] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information

[PatrickFarley]

@wiazur , please review and merge this PR, thanks

[PatrickFarley]

@wiazur ping

[wiazur]

Thanks @PatrickFarley!