OF-200: On users admin page, distinguish between unused and online users. (#919)

On the user overview page on the admin console, the column 'last logged out' now either displays
'online' or 'never logged in before', instead of being empty.

src/i18n/openfire_i18n_en.properties

@@ -2552,6 +2552,7 @@ user.properties.locksuccess=User locked out successfully.
 user.properties.unlocksuccess=User unlocked successfully.
 user.properties.isadmin=User has administrative privileges.
 user.properties.additional_properties=Additional Properties
+user.properties.never_logged_in=Never logged in before.
 
 # User roster Page
 

src/i18n/openfire_i18n_nl.properties

@@ -1717,6 +1717,7 @@ user.properties.locked=This account is currently locked out.
 user.properties.locked_set=This account has a lockout scheduled.
 user.properties.locksuccess=User locked out successfully.
 user.properties.unlocksuccess=User unlocked successfully.
+user.properties.never_logged_in=Nog nooit ingelogd
 
 # User search Page
 

src/web/user-summary.jsp

@@ -261,13 +261,16 @@
             <%= user.getCreationDate() != null ? JiveGlobals.formatDate(user.getCreationDate()) : "&nbsp;" %>
         </td>
         <td width="23%">
-            <% long logoutTime = presenceManager.getLastActivity(user);
-                if (logoutTime > -1) {
+            <% if (presenceManager.isAvailable(user)) { %>
+            <fmt:message key="session.details.online" />
+            <% } else {
+                 long logoutTime = presenceManager.getLastActivity(user);
+                 if (logoutTime > -1) {
                     out.println(StringUtils.getElapsedTime(logoutTime));
-                }
-                else {
-                    out.println("&nbsp;");
-                } %>
+                 } else { %>
+            <fmt:message key="user.properties.never_logged_in" />
+            <%   }
+               }%>
         </td>
          <%  // Don't allow editing or deleting if users are read-only.
             if (!UserManager.getUserProvider().isReadOnly()) { %>