Fix NPE when querying component metadata for projects without findings

[nscuro]

Description

Fixes NPE when querying component metadata for projects without findings.

The method to bulk query component metadata turned out to return metadata for all components when given an empty list is input. Trying to correlate the returned data with the non-existent findings caused a NPE.

Addressed Issue

Regression introduced in #3869

Additional Details

N/A

Checklist

• [x] I have read and understand the contributing guidelines
• [x] This PR fixes a defect, and I have provided tests to verify that the fix is effective
• ~This PR implements an enhancement, and I have provided tests to verify that it works as intended~
• ~This PR introduces changes to the database model, and I have added corresponding update logic~
• ~This PR introduces new or alters existing behavior, and I have updated the documentation accordingly~

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.00% (target: -1.00%)	:white_check_mark: 100.00% (target: 70.00%)

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (6def6128c1e5046756cadd4f2327f2ad02dad6ab) | 21901 | 16648 | 76.01% | | | Head commit (6727a14a212a101542bbb6ed9389ed7dedf02773) | 21903 (+2) | 16650 (+2) | 76.02% (**+0.00%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#3889) | 2 | 2 | **100.00%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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