Multi Select Dialog - Retun all rows when the param that given to Filter is empty

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1

Dears,

I am trying to use Multi Select Dialog to get some records by giving the filter 2 parameters .
How can I get all record if the given parameters were empty?

    var d =   new frappe.ui.form.MultiSelectDialog({
          doctype: "Cheque",
          target: me.frm,
          setters: {
            cheque_no: "",
            cheque_value_date: "",
            cheque_bank:""
          },
          date_field: "cheque_value_date",
          get_query() {
              return {
                  filters: {
                     cheque_status: ['=', ch_status],
                     current_account: ['=', vr_account]
                   }
              }
          },