Output buffer problem

Hi @ecwid_team,
I would like to report an issue which cause other plugins to break. The problem is that you are missing to use ob_start() in one place which cause your code to close output buffer which is not started by your plugin.

The missing place is ecwid-shopping-cart.php -> ecwid_get_product_browser_url_script() function. Here is the fixed version of this function:

function ecwid_get_product_browser_url_script()
{
	if ( get_option('ecwid_disable_pb_url' ) ) {
		return;
	}

	$str = '';
	if (ecwid_is_store_page_available() && !Ecwid_Store_Page::is_store_page()) {

		$url = esc_js( Ecwid_Store_Page::get_store_url() );

        ob_start();
        ?>
        <script data-cfasync="false" type="text/javascript">
            window.ec = window.ec || Object();
            window.ec.config = window.ec.config || Object();
            window.ec.config.store_main_page_url = '<?php echo esc_js( $url ); ?>';
        </script>
        <?php 
        $str = ob_get_clean();
	}

	return $str;

}