Check for cached data fails

In path_breadcrumbs.module (line 553-555), you have:

 if ($cache = cache_get(__FUNCTION__, PATH_BREADCRUMBS_CACHE_STORAGE)) {
      $data = $cache->data;
    }

The problem is that $cache is an empty object, so we need to check $cache->data first.

This patch fixes the problem. Without it, Path Breadcrumbs 7.x-3.x-dev doesn't work for me.

I should note, I had the caching options disabled for PB.