Output is buferred when exception is thrown inside {capture} tag

[HonzaMatosik]

Version: 2.10.*

Bug Description

When exception is thrown inside {capture} tag, ob_get_clean isn't called and all output is captured.
Related with: 075604d

Steps To Reproduce

Create exception inside {capture} tag:

{capture $foo}
	{$bar->undefinedMethod()}
{/capture}

This will compile to php code:

ob_start(function () {});
echo '	';
echo LR\Filters::escapeHtmlText($bar->undefinedMethod()) /* line 2 */;
echo "\n";
$ʟ_fi = new LR\FilterInfo('html');
$foo = ob_get_length() ? new LR\Html(ob_get_clean()) : ob_get_clean();

And once exception is thrown, then output is bufferred and no data are send.

Expected Behavior

End output buffering in case of error, to allow output (like error page) to render.