Handle Promise rejections when importing accounts (#4142)

* Silently catch import failures since errors exist in Redux state
* Add comment about no-op catch statement

mascara/src/app/first-time/import-account-screen.js

@@ -70,10 +70,14 @@ class ImportAccountScreen extends Component {
     switch (this.state.selectedOption) {
       case OPTIONS.JSON_FILE:
         return importNewAccount('JSON File', [ jsonFile, password ])
+          // JS runtime requires caught rejections but failures are handled by Redux
+          .catch()
           .then(next)
       case OPTIONS.PRIVATE_KEY:
       default:
         return importNewAccount('Private Key', [ privateKey ])
+          // JS runtime requires caught rejections but failures are handled by Redux
+          .catch()
           .then(next)
     }
   }

old-ui/app/accounts/import/json.js

@@ -96,6 +96,8 @@ class JsonImportSubview extends Component {
     }
 
     this.props.importNewAccount([ fileContents, password ])
+      // JS runtime requires caught rejections but failures are handled by Redux
+      .catch()
   }
 }
 

old-ui/app/accounts/import/private-key.js

@@ -64,4 +64,6 @@ PrivateKeyImportView.prototype.createNewKeychain = function () {
   const input = document.getElementById('private-key-box')
   const privateKey = input.value
   this.props.dispatch(actions.importNewAccount('Private Key', [ privateKey ]))
+    // JS runtime requires caught rejections but failures are handled by Redux
+    .catch()
 }

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

@@ -105,6 +105,8 @@ class JsonImportSubview extends Component {
     }
 
     this.props.importNewJsonAccount([ fileContents, password ])
+      // JS runtime requires caught rejections but failures are handled by Redux 
+      .catch()
   }
 }
 

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

@@ -91,5 +91,7 @@ PrivateKeyImportView.prototype.createNewKeychain = function () {
   const { importNewAccount, history } = this.props
 
   importNewAccount('Private Key', [ privateKey ])
+    // JS runtime requires caught rejections but failures are handled by Redux 
+    .catch()
     .then(() => history.push(DEFAULT_ROUTE))
 }