详细问题描述
unicloud查看集合列表，内容不显示，云函数能正常查询
重现步骤
[步骤]
正常添加shops数据，有一天我想删除集合里面的某个字段，我把值设置成了null，null也在支持的数据类型中，能正常保存，后来就发现数据显示不出来了
[结果]
chunk-libs.c8fb43bf.js:18 TypeError: Cannot read property 'length' of null
at a.more (chunk-7b0a925a.949d7034.js:1)
at chunk-7b0a925a.949d7034.js:1
at a.Le [as _l] (chunk-libs.c8fb43bf.js:18)
at chunk-7b0a925a.949d7034.js:1
at a.Le [as _l] (chunk-libs.c8fb43bf.js:18)
at a.n (chunk-7b0a925a.949d7034.js:1)
at a.t._render (chunk-libs.c8fb43bf.js:18)
at a.n (chunk-libs.c8fb43bf.js:18)
at en.get (chunk-libs.c8fb43bf.js:18)
at en.run (chunk-libs.c8fb43bf.js:18)
[期望]
过滤null或者支持
