Update src/mcp/server/fastmcp/server.py

Co-authored-by: ihrpr <inna.hrpr@gmail.com>

Author: tim-watcha

src/mcp/server/fastmcp/server.py

@@ -180,7 +180,7 @@ def instructions(self) -> str | None:
         return self._mcp_server.instructions
 
     def run(
-        self, transport: Literal["stdio", "sse"] = "stdio", mount_path: str = ""
+        self, transport: Literal["stdio", "sse"] = "stdio", mount_path: str = None
     ) -> None:
         """Run the FastMCP server. Note this is a synchronous function.