Merged 2.2 to HEAD

8729: Fix for AWC-1957 & AWC-1962 (Administrator is unable to add any user to "Selected users/groups and their role(s)" list)

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@8777 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/web/bean/wizard/BaseInviteUsersWizard.java

@@ -209,6 +209,7 @@ public abstract class BaseInviteUsersWizard extends BaseWizardBean
       super.init(parameters);
       
       notify = NOTIFY_NO;
+      userRolesDataModel = null;
       userGroupRoles = new ArrayList<UserGroupRole>(8);
       mailHelper = new TemplateMailHelperBean();
       mailHelper.setMailSender(mailSender);