fix infinite loading spinner when incorrect UUID is provided

[RyanCoulsonCA]

Related Item(s)

#522

Changes

• Fixes an issue where the loading spinner never disappeared if a non-existent UUID was provided.

Testing

Steps:

1. Open the demo link.
2. Click "Load Existing Storylines Product".
3. Enter a UUID that doesn't exist.
4. Ensure that the loading spinner doesn't stick around forever. It should disappear as soon as the "UUID doesn't exist" alert pops up.

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This change is 

[github-actions]

Your demo site is ready! 🚀 Visit it here: https://ramp4-pcar4.github.io/storylines-editor/fix-522

[gordlin]

Seems to work!

A related problem I've noticed: There used to be a warning when the server isn't available when you try to load the UUID ("Failed to load product, no response from server"), but now it doesn't show anything. If it's not an easy fix, we can create a new issue for this.

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @RyanCoulsonCA)

[RyanCoulsonCA]

Looks like this is because of lack of connection to the websocket. When issue 525 is finished, we should display a warning message when there's no websocket connection established, so this one should resolve itself then.

Side note, but that "Failed to load product" string was in lang.csv twice, so I've removed one.

Reviewable status: 1 of 2 files reviewed, all discussions resolved (waiting on @gordlin)

[IshavSohal]

Reviewed 1 of 1 files at r1, 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @RyanCoulsonCA)

[yileifeng]

Reviewed 1 of 1 files at r1, 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @RyanCoulsonCA)