clean up

app/scripts/metamask-controller.js

@@ -423,7 +423,6 @@ module.exports = class MetamaskController extends EventEmitter {
   }
 
 
-
 //=============================================================================
 // VAULT / KEYRING RELATED METHODS
 //=============================================================================
@@ -537,6 +536,8 @@ module.exports = class MetamaskController extends EventEmitter {
    */
   async connectHardware (deviceName, page) {
 
+    switch (deviceName) {
+      case 'trezor':
         const keyringController = this.keyringController
         const keyring = await keyringController.getKeyringsByType(
           'Trezor Hardware'
@@ -546,10 +547,12 @@ module.exports = class MetamaskController extends EventEmitter {
         }
 
         const accounts = await keyring.getPage(page)
-
         this.accountTracker.syncWithAddresses(accounts.map(a => a.address))
-
         return accounts
+
+      default:
+        throw new Error('MetamaskController - Unknown device')
+    }
   }
 
   /**