PLT-6268 Clear blue bar correctly when removing expiring license (#6247)

* Don't sanitize license for system admin

* Clear blue bar error whe removing expiring license

* Fix unit test

webapp/components/admin_console/license_settings.jsx

@@ -5,6 +5,7 @@ import $ from 'jquery';
 import ReactDOM from 'react-dom';
 import * as Utils from 'utils/utils.jsx';
 
+import ErrorStore from 'stores/error_store.jsx';
 import {uploadLicenseFile, removeLicenseFile} from 'actions/admin_actions.jsx';
 
 import {injectIntl, intlShape, defineMessages, FormattedMessage, FormattedHTMLMessage} from 'react-intl';
@@ -80,6 +81,7 @@ class LicenseSettings extends React.Component {
             () => {
                 $('#remove-button').button('reset');
                 this.setState({fileSelected: false, fileName: null, serverError: null});
+                ErrorStore.clearLastError(true);
                 window.location.reload(true);
             },
             (error) => {