A new warning when running `npm test`

[jtgeibel]

When running npm test I'm seeing the following warning for several tests:

ok 31 Chrome 79.0 - [1159 ms] - Acceptance | crates page: /crates is accessible
    ---
        browser log: |
            WARN: ember-moment: an empty value (null, undefined, or "") was passed to ember-moment helper
            WARN: ember-moment: an empty value (null, undefined, or "") was passed to ember-moment helper
            WARN: ember-moment: an empty value (null, undefined, or "") was passed to ember-moment helper
            WARN: ember-moment: an empty value (null, undefined, or "") was passed to ember-moment helper
            WARN: ember-moment: an empty value (null, undefined, or "") was passed to ember-moment helper
            WARN: ember-moment: an empty value (null, undefined, or "") was passed to ember-moment helper
            WARN: ember-moment: an empty value (null, undefined, or "") was passed to ember-moment helper
            WARN: ember-moment: an empty value (null, undefined, or "") was passed to ember-moment helper
    ...

I've checked a few CI logs and think this was introduced in #2137. cc @Turbo87

[Turbo87]

yeah, that is very likely. ultimately my goal is to replace the inconsistent static test fixtures with a setup using mirage factories, which should fix this issue. unfortunately I won't have time to work on it again until next week though 😞