Description of problem:

The Java external provider throws a nil panic here https://github.com/konveyor/analyzer-lsp/blob/main/external-providers/java-external-provider/pkg/java_external_provider/service_client.go#L70 if a rule is passed without this field. There is a rule in our default rulesets in 0.7 that triggers this. 

We should add a nil check at this condition in the Java provider, as well as fix the rule that is missing this field (tbd).

How reproducible:

100%

Steps to Reproduce:
1. Use 0.7 default rulesets
2. Run analysis without targets (full rulesets)