DROOLS-6638 DMN OAS generation NPE

[tarilabs]

fix NPE bug as described in:

JIRA: https://issues.redhat.com/browse/DROOLS-6638

referenced Pull Requests: none

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[tarilabs]

Jenkins retest this

[tarilabs]

jenkins run cdb

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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[tarilabs]

cdb failure unrelated

09:29:27  [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project optaplanner-core: Compilation failure: Compilation failure: 
09:29:27  [ERROR] /home/jenkins/workspace/KIE/main/compile/drools-main.compile/bc/kiegroup_optaplanner/optaplanner-core/src/main/java/org/optaplanner/core/config/domain/ReflectionsKieVfsUrlType.java:[83,39] cannot find symbol
09:29:27  [ERROR]   symbol:   method toPortableString()
09:29:27  [ERROR]   location: class org.kie.memorycompiler.resources.KiePath
09:29:27  [ERROR] /home/jenkins/workspace/KIE/main/compile/drools-main.compile/bc/kiegroup_optaplanner/optaplanner-core/src/main/java/org/optaplanner/core/config/domain/ReflectionsKieVfsUrlType.java:[136,37] cannot find symbol
09:29:27  [ERROR]   symbol:   method toPortableString()
09:29:27  [ERROR]   location: class org.kie.memorycompiler.resources.KiePath
09:29:27  [ERROR] -> [Help 1]
09:29:27  org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project optaplanner-core: Compilation failure

[pibizza]

Minor comment on remote resources.