fix #1762: show blog url in the share blog spinner if the blog title is an empty string
use getBlogNameFromAccountMap
Merge pull request #1765 from wordpress-mobile/issue/1762-share-intent-empty-string-blog-title

fix #1762 show blog url in the share blog spinner if the blog title is an empty string
Merge branch 'develop' of https://github.com/wordpress-mobile/WordPress-Android into issue/1730-reader-detail-infinite-scroll-with-blocking