fix for invalid reference on charts with no data

diff --git a/web/dashboard.js b/web/dashboard.js
index bc5dd562f07aa35433962be160b3b945d18650b4..b0192d8c694600cae1717a911bc202193bb1c623 100755 (executable)
--- a/web/dashboard.js
+++ b/web/dashboard.js
@@ -1308,7 +1308,7 @@
 
 
                var noDataToShow = function() {
-                       this.legendUpdateDOM();
+                       that.legendUpdateDOM();
                        that.tm.last_autorefreshed = new Date().getTime();
                        that.data_update_every = 30 * 1000;
                }