Fix then-catch + error handling in import-account

ui/app/components/pages/create-account/import-account/json.js

@@ -106,8 +106,6 @@ class JsonImportSubview extends Component {
     }
 
     importNewJsonAccount([ fileContents, password ])
-      // JS runtime requires caught rejections but failures are handled by Redux
-      .catch()
       .then(({ selectedAddress }) => {
         if (selectedAddress) {
           history.push(DEFAULT_ROUTE)
@@ -116,6 +114,7 @@ class JsonImportSubview extends Component {
           setSelectedAddress(firstAddress)
         }
       })
+      .catch(err => displayWarning(err))
   }
 }
 

ui/app/components/pages/create-account/import-account/private-key.js

@@ -96,8 +96,6 @@ PrivateKeyImportView.prototype.createNewKeychain = function () {
   const { importNewAccount, history, displayWarning, setSelectedAddress, firstAddress } = this.props
 
   importNewAccount('Private Key', [ privateKey ])
-    // JS runtime requires caught rejections but failures are handled by Redux 
-    .catch()
     .then(({ selectedAddress }) => {
       if (selectedAddress) {
         history.push(DEFAULT_ROUTE)
@@ -106,4 +104,5 @@ PrivateKeyImportView.prototype.createNewKeychain = function () {
         setSelectedAddress(firstAddress)
       }
     })
+    .catch(err => displayWarning(err))
 }