Confusing output from --testdox for empty test class

[theseer]

When running PHPUnit with --testdox, test classes that do not contain any actual tests (yet), cause a rather confusing, not helpful output:

class SampleTest extends PHPUnit_Framework_Testcase {}

theseer@nyda ~/testdox $ phpunit --testdox SampleTest.php 
PHPUnit 4.6.9 by Sebastian Bergmann and contributors.

PHPUnit_Framework_Warning
 [ ] Warning

This gets even more confusing when there are multiple empty test classes as they all get mangled into one output:

theseer@nyda ~/testdox $ phpunit .
PHPUnit 4.6.9 by Sebastian Bergmann and contributors.

FF

Time: 154 ms, Memory: 13.25Mb

There were 2 failures:

1) Warning
No tests found in class "OtherTest".

2) Warning
No tests found in class "SampleTest".

FAILURES!
Tests: 2, Assertions: 0, Failures: 2.

theseer@nyda ~/testdox $ phpunit --testdox .
PHPUnit 4.6.9 by Sebastian Bergmann and contributors.

PHPUnit_Framework_Warning
 [ ] Warning