fix: default to empty EvaluationContext when None passed to setter

Signed-off-by: buildingisfun23 <buildingisfun23@users.noreply.github.com>

Author: buildingisfun23

openfeature/client.py

@@ -98,7 +98,7 @@ def get_metadata(self) -> ClientMetadata:
         return ClientMetadata(domain=self.domain)
 
     def set_evaluation_context(self, context: EvaluationContext) -> None:
-        self.context = context
+        self.context = context or EvaluationContext()
 
     def get_evaluation_context(self) -> EvaluationContext:
         return self.context