Slightly improve logged warning message

Signed-off-by: Fabrice Normandin <normandf@mila.quebec>

milatools/utils/local_v2.py

@@ -184,7 +184,6 @@ async def run_async(
     subprocess.CalledProcessError
         If an error occurs when running the command and `warn` is `False`.
     """
-    command_with_input = program_and_args + ((input,) if input else ())
 
     logger.debug(f"Calling `asyncio.create_subprocess_exec` with {program_and_args=}")
     proc = await asyncio.create_subprocess_exec(
@@ -195,17 +194,19 @@ async def run_async(
         start_new_session=False,
     )
     if input:
+        # TODO: Getting a bug when sending 'echo $SCRATCH'!
         logger.debug(f"Sending {input=!r} to the subprocess' stdin.")
-
     stdout, stderr = await proc.communicate(input.encode() if input else None)
 
     assert proc.returncode is not None
     if proc.returncode != 0:
-        logger.debug(
-            f"[{command_with_input!r}"
+        message = (
+            f"{program_and_args!r}"
             + (f" with input {input!r}" if input else "")
-            + f" exited with {proc.returncode}]"
+            + f" exited with {proc.returncode}"
+            + (f": {stderr}" if stderr else "")
         )
+        logger.debug(message)
         if not warn:
             if stderr:
                 logger.error(stderr)
@@ -216,11 +217,7 @@ async def run_async(
                 stderr=stderr,
             )
         if hide is not True:  # don't warn if hide is True.
-            logger.warning(
-                RuntimeWarning(
-                    f"Command {program_and_args!r} returned non-zero exit code {proc.returncode}: {stderr}"
-                )
-            )
+            logger.warning(RuntimeWarning(message))
     result = subprocess.CompletedProcess(
         args=program_and_args,
         returncode=proc.returncode,