fix getAttribute exception in notes plugin #3285
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@ -148,7 +148,7 @@ const Plugin = () => {
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// Look for notes defined in an aside element
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if( notesElements ) {
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messageData.notes = Array.from(notesElements).map( notesElement => notesElement.innerHTML ).join( '\n' );
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messageData.markdown = typeof notesElements[0].getAttribute( 'data-markdown' ) === 'string';
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messageData.markdown = notesElements[0] && typeof notesElements[0].getAttribute( 'data-markdown' ) === 'string';
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}
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speakerWindow.postMessage( JSON.stringify( messageData ), '*' );
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