fix(Kling Image API Node): do not pass "image_type" when no image (Comfy-Org#9271)

* fix(Kling Image API Node): do not pass "image_type" when no image

* fix(Kling Image API Node): raise client-side error when kling_v1 is used with reference image

Author: bigcat88

comfy_api_nodes/nodes_kling.py

@@ -1690,7 +1690,11 @@ async def api_call(
     ):
         self.validate_prompt(prompt, negative_prompt)
 
-        if image is not None:
+        if image is None:
+            image_type = None
+        elif model_name == KlingImageGenModelName.kling_v1:
+            raise ValueError(f"The model {KlingImageGenModelName.kling_v1.value} does not support reference images.")
+        else:
             image = tensor_to_base64_string(image)
 
         initial_operation = SynchronousOperation(