Is it possible to execute the update definition so that it does not overwrite empty value with "?" ?

Update Definition in the SoapUI 5.3.0
I have several dozen of test cases where I test empty values.
Example a test case for password:: 
<password></password>
After the SoapUI Definition update, the empty value entered by "?"
<password>?</password>
I checked these update configurations:
https://thewonggei.wordpress.com/2010/12/29/soapui-tip-options-for-refreshing-a-wsdl-definition/
And every time he overrides me "?".
Is it possible to execute the update definition so that it does not overwrite "?"?