Hello guys,

i think i have found a sollution (not elegant) :

- in the war overlay you create this class 
: java/org/apereo/cas/config/CasRestAuthenticationConfiguration.java
- you copy paste the original code for github
- in the MAPPER object definition you add the following line :

.configure(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true);


The empty value will be converted to null => juste make sure null value is 
not problem in the rest of the code.

Hope this help

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