Minor - Avoid notice and change developers warning - refs CT#7769

main/inc/lib/display.lib.php

@@ -2151,14 +2151,14 @@ class Display
         $html .= '<div id="' . $id . '" class="actions">';
         $html .= '<div class="row">';
         if ($col > 4) {
-            $html = '<div class="alert alert-warning" role="alert">Not exceeding four columns</div>';
+            $html = '<div class="alert alert-warning" role="alert">Action toolbar design does not work when exceeding four columns - check Display::toolbarAction()</div>';
         } else {
             for ( $i = 0; $i < $col; $i++ ) {
                 $html .= '<div class="col-md-' . $columns . '">';
                 if ( $col == 2 && $i == 1 ) {
-                    if($right === true){
+                    if ($right === true) {
                         $html .= '<div class="pull-right">';
-                        $html .= $content[$i];
+                        $html .= (isset($content[$i])?$content[$i]:'');
                         $html .= '</div>';
                     } else {
                         $html .= $content[$i];