fix no-stream completion

Author: ea-rus

minds/minds.py

@@ -126,11 +126,14 @@ def completion(self, message: str, stream: bool = False) -> Union[str, Iterable[
             stream=stream
         )
         if stream:
-            for chunk in response:
-                yield chunk.choices[0].delta
+            return self.stream_response(response)
         else:
             return response.choices[0].message.content
 
+    def stream_response(self, response):
+        for chunk in response:
+            yield chunk.choices[0].delta
+
 
 class Minds:
     def __init__(self, client):