fixed building stack_url in QueueAPIClient

Author: Albert Sedlacek

src/client/queue_api.py

@@ -28,6 +28,8 @@ def __init__(self, sapi_token: str, keboola_stack: str, custom_stack: Optional[s
     def get_stack_url(keboola_stack: str, custom_stack: Optional[str]):
         if keboola_stack == "Custom Stack":
             stack_url = CLOUD_URL.replace("{STACK}", custom_stack)
+        elif keboola_stack == "-":
+            stack_url = QUEUE_V2_URL.replace("{STACK}", "")
         else:
             stack_url = QUEUE_V2_URL.replace("{STACK}", keboola_stack)