Add ignore_errors option to rcube_db, so error logging can be disabled temporarily

Use ignore_errors to make sure the DDL upgrade errors are printed only once.

program/include/rcmail_utils.php

@@ -198,7 +198,10 @@ class rcmail_utils
                 echo "Updating database schema ($v)... ";
             }
 
+            // Ignore errors here to print the error only once
+            $db->set_option('ignore_errors', true);
             $error = self::db_update_schema($package, $v, "$dir/$v.sql");
+            $db->set_option('ignore_errors', false);
 
             if ($error) {
                 if (!$opts['quiet']) {

program/lib/Roundcube/rcube_db.php

@@ -538,10 +538,12 @@ class rcube_db
             $this->db_error = true;
             $this->db_error_msg = sprintf('[%s] %s', $error[1], $error[2]);
 
-            rcube::raise_error(array('code' => 500, 'type' => 'db',
-                'line' => __LINE__, 'file' => __FILE__,
-                'message' => $this->db_error_msg . " (SQL Query: $query)"
-                ), true, false);
+            if (empty($this->options['ignore_errors'])) {
+                rcube::raise_error(array(
+                        'code' => 500, 'type' => 'db', 'line' => __LINE__, 'file' => __FILE__,
+                        'message' => $this->db_error_msg . " (SQL Query: $query)"
+                    ), true, false);
+            }
         }
 
         return false;