Update /api/comments/byepisodeid to handle episode without a socialInteract

[stevencrader]

Resolves #265

[stevencrader]

@dellagustin can you look at this?

[dellagustin]

Hello @stevencrader , how did you test this? Directly calling the /api/comments/byepisodeid endpoint?
As far as I know, if socialInteract is not used by an episode, the Show comments button will not be shown.
Of course, it should be fixed regardless, but I just wanted to know if this is actually a bug observed during a regular user journey, or something that is only a "sanity check" fix.

[stevencrader]

Hi @dellagustin. I did call it directly.

I noticed there was a typo in length and wanted to verify it was a real issue and then test my fix.

I agree that the logic before won't call this if there isn't a socialInteract tag do it isn't that big of an issue.

[dellagustin]

It should fix #232 as well, same as #265.
I'll run a quick test.

[dellagustin]

@daveajones Looks good to me now.
I recommend using Squash and merge for this one.