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

for more information, see https://pre-commit.ci

nbconvert/exporters/qt_exporter.py

@@ -19,6 +19,7 @@ def _check_launch_reqs(self):
         if sys.platform.startswith("win") and self.format == "png":
             raise RuntimeError("Exporting to PNG using Qt is currently not supported on Windows.")
         from .qt_screenshot import QT_INSTALLED
+
         if not QT_INSTALLED:
             raise RuntimeError(
                 f"PyQtWebEngine is not installed to support Qt {self.format.upper()} conversion. "