Hotfix // Fix error when multi fetch is called with 0 resources

[Dinika]

Fixes #
An error is shown to the user when we call multi-fetch api with empty array. (for example, in staging, choose bbp/mouselight project, Dataset type, subject.species.label path and does not contain predicate).

We can remove this error from being displayed by simply not calling the api if no match was found to the predicate (i.e. when the ES search api returned 0 hits)

How has this been tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added necessary unit and integration tests.
• I have added screenshots (if applicable), in the comment section.