Fix paper-select error message

Author: wukongrita

addon/components/paper-select/component.js

@@ -28,6 +28,7 @@ class PaperSelect extends Component.extend(ValidationMixin, ChildMixin) {
   validationProperty = 'selected';
   isTouched = false;
   isFocused = false;
+  hideAllMessages = false;
 
   @and('isInvalid', 'isTouched')
   isInvalidAndTouched;

addon/components/paper-select/template.hbs

@@ -32,4 +32,15 @@
     {{yield opt term}}
   </PowerSelect>
 
-</md-input-container>
+  {{#unless this.hideAllMessages}}
+    <div class="md-errors-spacer"></div>
+
+    {{#if this.isInvalidAndTouched}}
+      <div class="md-input-messages-animation md-auto-hide">
+        <div class="paper-input-error ng-enter ng-enter-active md-input-message-animation" style="opacity: 1; margin-top: 0">
+          {{@errors}}
+        </div>
+      </div>
+    {{/if}}
+  {{/unless}}
+</md-input-container>