[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

src/lightning/pytorch/core/optimizer.py

@@ -274,7 +274,7 @@ def _configure_schedulers_automatic_opt(schedulers: list, monitor: Optional[str]
             scheduler["reduce_on_plateau"] = scheduler.get(
                 "reduce_on_plateau", isinstance(scheduler["scheduler"], optim.lr_scheduler.ReduceLROnPlateau)
             )
-            if scheduler["reduce_on_plateau"] and scheduler.get("monitor", None) is None:
+            if scheduler["reduce_on_plateau"] and scheduler.get("monitor") is None:
                 raise MisconfigurationException(
                     "The lr scheduler dict must include a monitor when a `ReduceLROnPlateau` scheduler is used."
                     ' For example: {"optimizer": optimizer, "lr_scheduler":'