This happens if you leave the event.title field null, or set it to an empty string.
如果让event . title字段为空，或者将它设置为空字符串就会出现这种情况。
This field will always have the value null after unmarshalling because.
在去除编组之后的字段值将一直保持是空值，因为它的值没有被序列化或反序列化。
The corresponding field in the business object is automatically set to null.
业务对象中的对应字段将自动设置为空。
They have a field that is null.
它们拥有一个值为null的字段。
NOT NULL - a NULL was found in field name.
NOTNULL——字段名中出现空值。
Every match sets a field to the captured result; every miss is set to null.
每个匹配都会把捕获结果设置到到对应的字段去；要是没有捕捉到就设为null。
A new field with null value will give you an error.
一个空值的新领域，将给你一个错误。
Get the field values we ignore possibility they are null!
获取字段值(我们忽略了它们可能为空的这个可能！)
Get the field values we ignore possibility they are null!
获取字段值(我们忽略了它们可能为空的这个可能！)
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