Handle serialization of empty LicenseChoice correctly

[patveck]

Closes #439

[codacy-production[bot]]

Coverage summary from Codacy

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Coverage variation	Diff coverage
:white_check_mark: +0.14%	:white_check_mark: 100.00%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (3702283abd718595c069025762979fb9dfcee26b) | 5924 | 4321 | 72.94% | | | Head commit (2b656b998a7940b9c3f2bee64fc038c307427159) | 5928 (+4) | 4332 (+11) | 73.08% (**+0.14%**) | **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 (#441) | 4 | 4 | **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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