Don't atomize closures

Summary: In a PHP5.3+ codebase with closures, Diviner would pick up anonymous functions and add them into the generated documentation. This causes them to be skipped.

Test Plan: Ran `bin/diviner generate --clean` before and after change, no longer got a bunch of unnamed functions dumped into the documentation.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9786

src/applications/diviner/atomizer/DivinerPHPAtomizer.php

@@ -22,6 +22,11 @@ final class DivinerPHPAtomizer extends DivinerAtomizer {
 
       $name = $func->getChildByIndex(2);
 
+      // Don't atomize closures
+      if ($name->getTypeName() === 'n_EMPTY') {
+        continue;
+      }
+
       $atom = $this->newAtom(DivinerAtom::TYPE_FUNCTION)
         ->setName($name->getConcreteString())
         ->setLine($func->getLineNumber())