Check for open captions when closed captions are present

[wolfgangw]

Our tech just came across a package made with dcp-o-matic which has ClosedCaption but not MainSubtitle.

This might be intentional - it's not in this case - and is not incorrect. But a hint when adding ClosedCaption without MainSubtitle would probably cover the majority case (adding MainSubtitle).

Package was authored with DCP-o-matic 2.16.65 2fac14d in 10.2023.

Sorry for the noise if this has been taken care of in the meantime (not using here) or came about in a different way.

[cth103]

Hi Wolfgang, that sounds like a good idea, I added it over on the main tracker: https://dcpomatic.com/bugs/view.php?id=2768

[wolfgangw]

Ah yes, bug tracker, thank you.