Description:
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The test for http://bugs.php.net/bug.php?id=26862 currently fails and results in the last echo statement (everything after ob_flush() and output_reset_rewrite_vars()) to get lost.

A variant of the issue was reintroduced after the output buffering rewrite.

This seems to happen because the output is never handled if there is no rewrite variables to process and there is no active buffer with contents. The output chars still needs to returned as handled.

The patch also contains a small change in the test to better differentiate the two echo statements.

Test script:
---------------
Based on: ext/session/tests/bug26862.phpt

<?php
session_start();
output_add_rewrite_var('var', 'value');

echo '<a href="file-first.php">link</a>';

ob_flush();

output_reset_rewrite_vars();
echo '<a href="file-second.php">link</a>';



Expected result:
----------------
<a href="file-first.php?var=value">link</a><a href="file-second.php">link</a>

Actual result:
--------------
<a href="file-first.php?var=value">link</a>