Empty metadata --> tool tag causes parsing exception

Hello, I have a question regarding an exception I get when parsing a 1.3 CycloneDX SBOM.

According to the specification, the `` tag in the `` section is an `array`, which does not specify a constraint to it's size: https://cyclonedx.org/docs/1.3/json/#metadata_tools

However, when I try to parse an SBOM like this using your library:

```xml

```

I get this exception:

```
com.fasterxml.jackson.databind.JsonMappingException: Cannot coerce empty String ("") to `org.cyclonedx.model.Tool` value (but could if coercion was enabled using `CoercionConfig`)
at [Source: UNKNOWN; byte offset: #UNKNOWN] (through reference chain: org.cyclonedx.model.Bom["metadata"])
```

The SBOM is generated using a tool, but it does not fill out this property.
I was wondering whether this behavior is intended or whether this is a difference to the specification that I did not understand.

Thank you for your time.

Reproduisez l’exception avec le XML CycloneDX 1.3 présenté, puis suivez la désérialisation à travers org.cyclonedx.model.Bom metadata et org.cyclonedx.model.Tool. Vérifiez si un élément tools vide est accepté par la spécification et considérez l’issue comme terminée lorsque cette entrée est traitée de manière cohérente sans l’exception de parsing signalée.

Rédigé par le modèle d'indexation à partir du texte de l'issue.