Fix conditional assignments

[GoodForOneFare]

The operation.done callback contains this CoffeeScript assignment:

      if @nextPageParams?
        @title = "Load next #{@LARGE_PAGE_SIZE} products"

The transformed JS is missing a this.title assignment:

      if (this.nextPageParams != null) {
        this.nextPageParams;
      }

[GoodForOneFare]

A couple of other affected files:

bulk_operations.coffee

data['value'] = operationData if operationData?

if (operationData != null) {
  operationData;
}

two_factor_auth.coffee:

password = $(form).find('input[name=password]').val()
@password = password if password?

var password = $(form).find('input[name=password]').val();

if (password != null) {
  password;
}