query parameters in play-spoken-text return entire text when empty string is passed

[hsluytergaethje]

When the query parameters (gender, role, relations) in the endpoint /corpora/{corpusname}/plays/{playname}/spoken-text are set to empty string, the entire text is returned just as if the parameter is not set at all. This behaviour seems quite implicit.
Maybe it would be good to differentiate between the parameter not being passed at all and being passed with empty string as value?
Or it be documented that the two cases produce the same result.

[cmil]

I think it is pretty common behaviour that when you specify query parameters like this ?foo=&bar=, the processing application should treat the parameters foo and bar as if they where not set. What other behaviour would you expect? And how would it differ from omitting the query altogether?