Incoming links kill forks

[aerugo]

Some incoming links to threads with forks stop all forks in that thread from rendering.

Post A links to topic B, and topic B is the root of a fork-chain. Post A does not fork, and just links to topic B.

If the link to topic B from post A is a link to the root URL of the topic (https://bbu.world/t/collaborative-whaling/1039), then none of the forks render when topic B is shown in the reader.

If the link to post B from post A is a link to the fourth post in the topic (https://bbu.world/t/collaborative-whaling/1039) then the last fork is not loaded while the others are.

I suspect that this is a problem because post A contains videos, so that when the reader looks at the HTML for post A when loading topic B, it crashes before it gets to rendering the forks.

It's possible to hack this problem by linking post A to a non-existant post in topic B, for example (https://bbu.world/t/collaborative-whaling/1039/10) as topic B only has 4 replies.

As there is a hack around this it's possible to use the reader with this error, but as it produces some pretty confusing behavior, it should be fixed eventually.

[jims]

This is a side-effect of #1, so fixing that will fix this.