[fix]使用StyleUtils.styleTable方法时，如果不设置tableStyle的width，会报空指针异常 #1168
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我本来想设置表格的边框以及内容居中，但是却报错空指针异常，经过调试排查发现，StyleUtils.styleTable()方法中，如果tableStyle的width参数为空，则TableTools.setWidth方法中就会出现问题，所以建议在使用StyleUtils.styleTable()方法的时候，对tableStyle.getWidth()进行判空，这样用户不必设置宽度参数，只需关注自己需要的参数即可~
