Fix `ObjectLocator` not working when BOM doesn't have a `metadata.component` node

[nscuro]

Fixes #455

[codacy-production[bot]]

Coverage summary from Codacy

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Coverage variation	Diff coverage
:white_check_mark: +0.79%	:white_check_mark: 100.00%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (e2f7db69fda60632ce759fbf293b8bdf3754cd91) | 5928 | 4332 | 73.08% | | | Head commit (1e97a11706e2a649111863eb8a240e96e7bbce26) | 5932 (+4) | 4382 (+50) | 73.87% (**+0.79%**) | **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 (#456) | 14 | 14 | **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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