Fix broken code in custom latent trajectory example

[PlethoraChutney]

Working with Hannah, we found a few parts of this example that do not work. This version fixes those regions. Not sure if the fixed version of the dataset saving is still the right way to go though, was this written before save_external_result()?

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Name	Status	Preview	Comments	Updated (UTC)
cryosparc-tools	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 18, 2023 10:35pm

[PlethoraChutney]

Sorry about that Nick, and sorry about a million commits here! In all of these cases, both the browser and VS Code were successfully showing the plot, and the <img> tag looked like it was still there, but not being rendered. I opted here to just save the image and include it as an attachment instead.

[nfrasser]

No worries Rich, thanks for working out the kinks!

[nfrasser]

Not sure if the fixed version of the dataset saving is still the right way to go though, was this written before save_external_result()?

Looks ok to me! Both save_external_result() and the save_output() strategy are valid. This strategy is nice because you can use alloc_output() to get a fresh empty dataset, which you can't do as easily with save_external_result()