Option to not pass fields with nulls in MongoDB output

[EYamada]

In earlier versions the MongoDB Output did not pass fields with null values; this was ideal for storing individual attributes, where one person may have 4 attributes and another may have only 2 attributes, because we did not waste space storing empty or null values.  The newer versions pass these fields with null values; I would like the option to not pass these fields. Please see an example below.  Thank you for your consideration.

Workflow Results

ID	Attribute1	Attribute2	Attribute3	Attribute4
1	A	B	C	D
2	Z	Y

MongoDB Output Current Versions

{"_id" : "1",
"Attribute1" : "A",
"Attribute2" : "B",
"Attribute3" : "C",

"Attribute4" : "D"}

{"_id" : "2",
"Attribute1" : "Z",
"Attribute2" : "Y",
"Attribute3" : null,

"Attribute4" : null}

Desired MongoDB Output (previous functionality)

{"_id" : "1",
"Attribute1" : "A",
"Attribute2" : "B",
"Attribute3" : "C",

"Attribute4" : "D"}

{"_id" : "2",
"Attribute1" : "Z",
"Attribute2" : "Y"}

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