idl2wsdl fails with NPE if a type cannot be resolved

idl2wsdl -verbose -o . -I . test.idl

idl2wsdl -verbose -o . -I . test.idl
idl2wsdl - Apache CXF 2.3.x-fuse-SNAPSHOT

 ( module CORBA ( interface Principal { } ) ( interface NamedValue { } ) ( interface TypeCode { } ) )
Error : org.apache.cxf.tools.common.ToolException

org.apache.cxf.tools.common.ToolException: org.apache.cxf.tools.common.ToolException
        at org.apache.cxf.tools.corba.processors.idl.IDLToWSDLProcessor.process(IDLToWSDLProcessor.java:88)
        at org.apache.cxf.tools.corba.processors.idl.IDLToWSDLProcessor.process(IDLToWSDLProcessor.java:79)
        at org.apache.cxf.tools.corba.IDLToWSDL.execute(IDLToWSDL.java:75)
        at org.apache.cxf.tools.common.toolspec.ToolRunner.runTool(ToolRunner.java:103)
        at org.apache.cxf.tools.common.toolspec.ToolRunner.runTool(ToolRunner.java:58)
        at org.apache.cxf.tools.common.toolspec.ToolRunner.runTool(ToolRunner.java:40)
        at org.apache.cxf.tools.corba.IDLToWSDL.run(IDLToWSDL.java:164)
        at org.apache.cxf.tools.corba.IDLToWSDL.main(IDLToWSDL.java:172)
Caused by: org.apache.cxf.tools.common.ToolException
        at org.apache.cxf.tools.corba.processors.idl.IDLToWSDLProcessor.parseIDL(IDLToWSDLProcessor.java:220)
        at org.apache.cxf.tools.corba.processors.idl.IDLToWSDLProcessor.process(IDLToWSDLProcessor.java:86)
        ... 7 more
Caused by: java.lang.NullPointerException
        at org.apache.cxf.tools.corba.processors.idl.ConstVisitor.visit(ConstVisitor.java:97)
        at org.apache.cxf.tools.corba.processors.idl.DefinitionVisitor.visit(DefinitionVisitor.java:85)
        at org.apache.cxf.tools.corba.processors.idl.ModuleVisitor.visit(ModuleVisitor.java:53)
        at org.apache.cxf.tools.corba.processors.idl.DefinitionVisitor.visit(DefinitionVisitor.java:57)
        at org.apache.cxf.tools.corba.processors.idl.WSDLASTVisitor.visit(WSDLASTVisitor.java:127)
        at org.apache.cxf.tools.corba.processors.idl.IDLToWSDLProcessor.parseIDL(IDLToWSDLProcessor.java:212)
        ... 8 more
Error : org.apache.cxf.tools.common.ToolException