#174220 by webernet: fix noticed in node module when a user has no adminiter nodes permission

modules/node/node.module

@@ -810,7 +810,7 @@ function node_save(&$node) {
     // Only store the log message if there's something to store; this prevents
     // existing log messages from being unintentionally overwritten by a blank
     // message. A new revision will have an empty log message (or $node->log).
-    $revisions_table_values['log'] = $node->log;
+    $revisions_table_values['log'] = !empty($node->log) ? $node->log : '';
     $revisions_table_types['log'] = "'%s'";
   }
   $node_table_values = array(

modules/node/node.pages.inc

@@ -130,7 +130,7 @@ function node_form(&$form_state, $node) {
 
   // Add a log field if the "Create new revision" option is checked, or if the
   // current user has the ability to check that option.
-  if ($node->revision || user_access('administer nodes')) {
+  if (!empty($node->revision) || user_access('administer nodes')) {
     $form['revision_information'] = array(
       '#type' => 'fieldset',
       '#title' => t('Revision information'),