fix(server.py): improve error handling by adding stdout and refining stderr checks to enhance output clarity

Author: tumf

src/mcp_shell_server/server.py

@@ -94,16 +94,16 @@ async def run_tool(self, arguments: dict) -> Sequence[TextContent]:
             if result.get("error"):
                 raise ValueError(result["error"])
 
-            # Filter out bash process control messages
+            # Add stdout if present
             if result.get("stdout"):
                 content.append(TextContent(type="text", text=result["stdout"]))
 
-            stderr = result.get("stderr", "")
-            if stderr and not stderr.startswith(
-                "bash: cannot set terminal process group"
-            ):
+            # Add stderr if present and not a process group message
+            stderr = result.get("stderr")
+            if stderr and not stderr.startswith("bash: cannot set terminal process group"):
                 content.append(TextContent(type="text", text=stderr))
 
+
         except asyncio.TimeoutError as e:
             raise ValueError(f"Command timed out after {timeout} seconds") from e