Wrap content in wordpress widget From http://wordpress.stackexchange.com/questions/74732/adding-a-div-to-wrap-widget-content-after-the-widget-title

wrap-widget.php

// if no title then add widget content wrapper to before widget
add_filter( 'dynamic_sidebar_params', 'check_sidebar_params' );
function check_sidebar_params( $params ) {
    global $wp_registered_widgets;

    $settings_getter = $wp_registered_widgets[ $params[0]['widget_id'] ]['callback'][0];
    $settings = $settings_getter->get_settings();
    $settings = $settings[ $params[1]['number'] ];

    if ( $params[0][ 'after_widget' ] == '</div></div>' && isset( $settings[ 'title' ] ) && empty( $settings[ 'title' ] ) )
        $params[0][ 'before_widget' ] .= '<div class="content">';

    return $params;
}