Check for unresolved quotes before obtaining

src/main/java/com/whitemagicsoftware/keenquotes/Parser.java

		);
		}
		- else if( mOpeningSingleQuotes.size() == 0 && mClosingSingleQuotes.size() == 1 ) {
		+ else if( mOpeningSingleQuotes.size() == 0 &&
		+ mClosingSingleQuotes.size() == 1 && !unresolved.isEmpty() ) {
		final var opening = unresolved.get( 0 );
		consumer.accept( new Token( QUOTE_OPENING_SINGLE, opening[ 1 ] ) );

Delta	2 lines added, 1 line removed, 1-line increase