Handle tally cases where results is None

[AetherUnbound]

Fixes

Fixes #1131 by @AetherUnbound

Description

This PR initializes results_to_tally to either results or [] so that any operations on it which assume it's a list will behave correctly.

Testing Instructions

1. Check out commit 65f2df5 and run just api-test - tests should fail and emulate current behavior
2. Check out the tip of this branch and run just api-test - tests should now pass!

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  Update index.md).
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[github-actions]

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https://wordpress.github.io/openverse-api/_preview/1132

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[zackkrida]

LGTM!

[sarayourfriend]

LGTM. Just one suggestion for clarifying the test's scenario.