IllegalArgumentException: Illegal null argument:ns - Raised initialising Service referencing a WSDL which imports a xsd with no namespace

The following exception is thrown when a Service is initialised using a WSDL that imports a schema with no namespace: -

java.lang.IllegalArgumentException: Illegal null argument:ns
at org.jboss.ws.metadata.wsdl.xmlschema.JBossXSModel.createNamespaceItemIfNotExistent(JBossXSModel.java:511)
at org.jboss.ws.metadata.wsdl.xmlschema.JBossXSModel.addXSElementDeclaration(JBossXSModel.java:351)
at org.jboss.ws.metadata.wsdl.xmlschema.WSSchemaUtils.copyXSModel(WSSchemaUtils.java:707)
at org.jboss.ws.tools.JavaToXSD.parseSchema(JavaToXSD.java:202)

In addition to this deploying an endpoint with this style of import results in the following error: -

DEPLOYMENTS IN ERROR:
Deployment "vfszip:/home/darranl/src/JBoss_5_1_0_GA/build/output/jboss-5.1.0.GA/server/default/deploy/jaxws-jbws2930.war/" is in error due to the following reason(s): java.lang.NullPointerException

at org.jboss.deployers.plugins.deployers.DeployersImpl.checkComplete(DeployersImpl.java:993)
at org.jboss.deployers.plugins.deployers.DeployersImpl.checkComplete(DeployersImpl.java:939)
at org.jboss.deployers.plugins.main.MainDeployerImpl.checkComplete(MainDeployerImpl.java:873)
at org.jboss.system.server.profileservice.repository.MainDeployerAdapter.checkComplete(MainDeployerAdapter.java:128)
at org.jboss.system.server.profileservice.hotdeploy.HDScanner.scan(HDScanner.java:369)
at org.jboss.system.server.profileservice.hotdeploy.HDScanner.run(HDScanner.java:255)