Personas empty by default

shared.py

@@ -38,7 +38,7 @@ class ModelConfig(BaseModel):
         
 
 class Client:
-    def __init__(self, api_url, api_key, personas):
+    def __init__(self, api_url, api_key, personas = {}):
         self.api_url = api_url
         self.api_key = api_key
         self.input_personas = personas