fix build failure
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@ -358,7 +358,10 @@ fn trigger_on_change<F>(book: &mut MDBook, closure: F) -> ()
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};
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// Add the theme directory to the watcher
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watcher.watch(book.get_theme_path(), Recursive).unwrap_or_default();
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if let Some(t) = book.get_theme_path() {
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watcher.watch(t, Recursive).unwrap_or_default();
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}
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// Add the book.{json,toml} file to the watcher if it exists, because it's not
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// located in the source directory
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