idl2wsdl fails with NPE if IDL contains typeprefix keyword
----------------------------------------------------------

                 Key: CXF-3297
                 URL: https://issues.apache.org/jira/browse/CXF-3297
             Project: CXF
          Issue Type: Bug
          Components: Tooling
    Affects Versions: 2.3.2
         Environment: CXF-2.3.x-SNAPSHOT, Windows
            Reporter: Torsten Mielke


If the IDL contains the CORBA 3.0 keyword 'typeprefix', idl2wsdl fails with a 
NullPointerException:

{code}
idl2wsdl -verbose -o wsdl/ test.idl
idl2wsdl - Apache CXF 2.3.x-fuse-SNAPSHOT

 ( typeprefix Test fusesource.com )
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.TypeDclVisitor.visit(TypeDclVisitor.java:77)
        at 
org.apache.cxf.tools.corba.processors.idl.DefinitionVisitor.visit(DefinitionVisitor.java:94)
        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
{code}


To reproduce use attached test.idl and run
idl2wsdl -verbose -o wsdl/ test.idl 

Although typeprefix is a keyword added in CORBA 3.0 spec only, we should at the 
very least raise a meaningful error message that typeprefix is not supported 
right now. Or even better, handle this keyword correctly.

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