minor #29068 Remove unused variable (jschaedl)

This PR was merged into the 4.2-dev branch.

Discussion
----------

Remove unused variable

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
-------

246b3bf757 Remove unused variable

src/Symfony/Bundle/FrameworkBundle/Command/DebugAutowiringCommand.php

@@ -86,7 +86,6 @@ EOF
         if ($search) {
             $io->text(sprintf('(only showing classes/interfaces matching <comment>%s</comment>)', $search));
         }
-        $tableRows = array();
         $hasAlias = array();
         $all = $input->getOption('all');
         $previousId = '-';