Merge pull request sebastianbergmann#244 from wormhit/master

hhvm code coverage fix. Lines to be ignored process existing files

Author: sebastianbergmann

src/CodeCoverage/Parser.php

@@ -127,7 +127,7 @@ public function getLinesToBeIgnored($filename)
             $this->ignoredLines[$filename] = array();
             $ignore                        = false;
             $stop                          = false;
-            $lines                         = file($filename);
+            $lines                         = file_exists($filename) ? file($filename) : array();
             $numLines                      = count($lines);
 
             foreach ($lines as $index => $line) {