Input2InputTransformer doesn't handle null input going from SDO->AXIOM
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                 Key: TUSCANY-1902
                 URL: https://issues.apache.org/jira/browse/TUSCANY-1902
             Project: Tuscany
          Issue Type: Bug
          Components: Java SCA Data Binding Runtime
    Affects Versions: Java-SCA-1.0
            Reporter: Scott Kurz
            Priority: Minor
             Fix For: Java-SCA-1.0.1


I get the following: 

  java.lang.NullPointerException
        at 
org.apache.tuscany.sca.core.databinding.transformers.Input2InputTransformer.transform(Input2InputTransformer.java:127)
        at 
org.apache.tuscany.sca.core.databinding.transformers.Input2InputTransformer.transform(Input2InputTransformer.java:46)
        at 
org.apache.tuscany.sca.databinding.impl.MediatorImpl.mediate(MediatorImpl.java:73)

when invoking a method such as:

public Person getGreetings() 

where Person is an SDO causing the SDO databinding to be set at the impl DB 
level, and where I am using the WS binding, causing AXIOM to be used as the 
target DB.

I'll attach a simple patch to check for null first in the unwrapped->wrapped 
case in which the problem occurs.

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