Support empty queues in sinfo

[TaekyungHeo]

Summary

Support empty queues in sinfo

Error before bugfix.

        def parse_sinfo_output(self, sinfo_output: str, node_user_map: Dict[str, str]) -> None:
            """                                                                       
            Parse the output from the 'sinfo' command to update node states.
                                    
            Args:                
                sinfo_output (str): The output from the sinfo command.
                node_user_map (dict): A dictionary mapping node names to users.
            """                                                                       
            for line in sinfo_output.split("\n")[1:]:  # Skip the header line
                if not line.strip():                                                  
                    continue                                                          
                parts = line.split()
>               partition, _, _, _, state, nodelist = parts[:6]
E               ValueError: not enough values to unpack (expected 6, got 5)

Test Plan

Updated a test case to cover empty queues.