[HOTFIX] Unlike Error

[AjobK]

closes #329

What is it supposed to do
Check #329 If you try to unlike a post that you haven't even liked yet, it no longer created an unhandled promise rejection.

For some reason you didn't get this error if you weren't loggedIn. Probably because there's a guard.

How can we test your branch
Check #329

Additional notes
None

1. General checklist

• [x] a. Tested happy flow.
• [x] b. Tested unhappy flow.
• [x] c. No unexpected exceptions.
• [x] d. No code with high complexity. (Big O)
• [x] e. EOF newline.
• [x] f. No linter warnings or errors.

2. If relevant, front-end checklist

• [ ] a. Responsive. (Desktop all the way to mobile 320px)
• [ ] b. Using SCSS variables where relevant.
• [ ] c. Relevant class names
• [ ] d. No modified global SCSS properties, except if necessary and fully tested the impact.
• [ ] e. Checked caniuse for more modern CSS properties.

3. If relevant, back-end checklist

• [x] a. No unhandled promise rejections.
• [x] b. Seeders still functional.
• [x] c. No primary-key violations.
• [x] d. Normalization, at least 3NF.
• [x] e. Used guards (middleware) where necessary and tested if route is guarded.

4. If relevant, test these browsers

• [ ] a. Chrome
• [ ] b. Firefox
• [ ] c. Opera
• [ ] d. Edge
• [ ] e. Safari

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3. Assign all reviewers allowed to merge the branch, including yourself.
4. If relevant to the sprint, put related issue in 'Awaiting Approval' column on project board.
5. Add to the corresponding milestone.

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