[data_release] Version column sort - fix (#7907)

- Transfer the int value to string to sort the mix type column. { 1 , version2 , v3}
- Add Unversioned into sorting.

Fixes #7894

Author: kongtiaowang

modules/data_release/jsx/dataReleaseIndex.js

@@ -119,9 +119,6 @@ class DataReleaseIndex extends Component {
           );
         }
         break;
-      case 'Version':
-        result = <td>{cell || 'Unversioned'}</td>;
-        break;
     }
     return result;
   }

modules/data_release/php/data_release.class.inc

@@ -61,7 +61,7 @@ class Data_Release extends \NDB_Menu_Filter
         // set the class variables
         $this->columns = [
             'file_name AS fileName',
-            'version',
+            'IF(version is null or version ="","Unversioned", version) AS version',
             'upload_date AS uploadDate',
             'dr.id as dataReleaseID',
         ];