Override to_representation instead of setting default

[dhruvkb]

Description

This PR fixes an error raised by the TagSerializer when supplied with an empty list [] as the instance to serialize. This default was earlier added to ensure that the value of the tag key is always a list but that goal can be achieved in a better way by overriding to_representation.

Error first reported in Slack by @AetherUnbound

Testing Instructions

0. Check out the PR and run the API services.
1. Make some API calls to /v1/images.
2. This error should not appear in the logs.

Checklist

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• I added or updated tests for the changes I made (if applicable).
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• I tried running the project locally and verified that there are no visible errors.

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[AetherUnbound]

Looks great! Another reason to tackle #557 😅

[sarayourfriend]

🏎️