message: throw error when balance is too little
diff: @@ -359,7 +359,7 @@ export default class PrepaidCard {
  let symbol = await token.methods.symbol().call();
  let balance = new BN(await token.methods.balanceOf(safeAddress).call());
  if (balance.lt(totalWeiAmount)) {
  - new Error(
  + throw new Error(
  `Safe not have enough balance to make prepaid card(s). The issuing token ${tokenAddress} balance of the safe ${safeAddress} is ${fromWei(
  balance
  )}, the total amount necessary to create prepaid cards is ${fromWei(
  