Hi 

I am implementing grpc on nodejs framework. I already have a database of my 
data and where some fields contain null values and also array fields also 
empty for some documents. So here is the problem while retrieving data from 
mongodb using grpc. It throwing an error proto3 field without field 
presence cannot be null). can anyone help me on how to fix this in proto 
file, not to throw error if fields are empty. Currently I'm using grpc 
package. 

Thanks, 
Ram Kumar K

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