Fix empty line when subtitle is not set #57
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当论文中不需要副标题时，如设置
副标题 = {{}, {}}的情况，此时用overleaf/sharelatex渲染在论文封面会出现空白的一行，影响论文版面。该PR修复了这一问题，并保证文章存在副标题时也能正常渲染。