How to clean an array from empyu objects in mongodb?

Afterwards an aggregation in mongodb I get this results:

[
  my_arr:[
    {
      id: ObjectId('618f7ef057c2923be10d1111')
      //other stuff
    },
    {},
    {},
  ]
]

Is there a way to remove the empty object directly in the aggregation? or it is necessary to do it server side? I get that after doing an unwind and a group.

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