Don't render faucet row in deposit modal for custom chains (#10674)

Fixes MetaMask/metamask-extension#10038

ui/app/components/app/modals/deposit-ether-modal/deposit-ether-modal.component.js

@@ -155,7 +155,8 @@ export default class DepositEtherModal extends Component {
               buttonLabel: this.context.t('viewAccount'),
               onButtonClick: () => this.goToAccountDetailsModal(),
             })}
-            {this.renderRow({
+            {networkName &&
+              this.renderRow({
                 logo: <i className="fa fa-tint fa-2x" />,
                 title: this.context.t('testFaucet'),
                 text: this.context.t('getEtherFromFaucet', [networkName]),