cache: check if cache folder exists

index.php

@@ -26,6 +26,7 @@ ini_set('user_agent', 'Mozilla/5.0 (X11; Linux x86_64; rv:30.0) Gecko/20121202 F
 // cache file purge - delete cache files older than 24 hours
 $cacheTimeLimit = time() - 60*60*24 ;
 $cachePath = 'cache';
+if(file_exists($cachePath)) {
    $cacheIterator = new RecursiveIteratorIterator(
      new RecursiveDirectoryIterator($cachePath),
      RecursiveIteratorIterator::CHILD_FIRST
@@ -38,6 +39,7 @@ foreach ($cacheIterator as $cacheFile) {
             unlink( $cacheFile->getPathname() );
          }
    }
+}
 
 // default whitelist
 $whitelist_file = './whitelist.txt';