trying to correct system_prompt pbm

agent.py

@@ -29,9 +29,9 @@ class QAgent:
         QAgent description 
         """
         print(f"Begin QAgent init with: ")
-        print(f"self.system_prompt = {self.system_prompt},  system_prompt = {system_prompt}")
+        print(f"self.system_prompt = {self.system_prompt or "empty"},  system_prompt = {system_prompt}")
         self.verbose = verbose
-        self.system_prompt = system_prompt
+        self.system_prompt = system_prompt or ""
 
 
         # if model_type == "HfApiModel":