Balance "required" validator fails for 0 value(s)

[ebisrat]

Metro2 Version: v0.5.1

What were you trying to do?

Generate a metro2 using the metro2 tool. I inputted a 0 value for the CurrentBalance on one of the base segments.

What did you expect to see?

A metro2 with a base segment and 0 current balance.

What did you see?

An error stating "current_balance in base segment is a required field"

How can we reproduce the problem?
Input a 0 current balance on one of the base segments and try to generate a metro2.

Note I created a similar ticket a couple of weeks ago here. I believe the issue this time is coming from this: https://github.com/moov-io/metro2/blob/master/pkg/client/model_base_segment.go#L40, when it converts the lib model into the client model and expects a non-zero value.