GUACAMOLE-926: Add class to error rows with actual errors for easier restyling.

guacamole/src/main/frontend/src/app/import/templates/connectionErrors.html

@@ -28,7 +28,7 @@
                 <td>{{error.rowNumber}}</td>
                 <td>{{error.name}}</td>
                 <td>{{error.protocol}}</td>
-                <td class="error-message">
+                <td class="error-message" ng-class="{ 'has-errors' : error.errors.getArray().length }">
                     <ul>
                         <li ng-repeat="message in error.errors.getArray()">
                             {{ message }}