Fix missing tags method check for emptiness and it's use in addArray method.
Fix missing tags method check for emptiness and it's use in addArray method.

- In *fixMissingTags* was fixed condition which check if attribute was presented in array. Before this commit functions checks many time if entire array is empty, but not if specific attribute (tag) was presented in array.
- Also in *addArray* method were swapped tags. In Sitemap protocol for *url* are required tags *loc* and optional lastmod, changefreq and priority. For *sitemap* is required only loc tag and lastmod is optional.
VIPnytt/SitemapParser