Meta multiselect fields didn't get saved if the meta key was not meta-robots-adv.
Only explode on comma if the mulitselect is the meta-robots-adv field, other multiselect fields (should) use serialized data.
Merge branch 'master' of github.com:Yoast/wordpress-seo into bugfix/meta-multiselect-fixes
Merge branch 'master' of github.com:Yoast/wordpress-seo into bugfix/meta-multiselect-fixes
Fixed two code style errors.
Merge branch 'master' of github.com:Yoast/wordpress-seo into bugfix/meta-multiselect-fixes
Added a missing paren char
Merge pull request #1206 from Yoast/bugfix/meta-multiselect-fixes

Bugfix/meta multiselect fixes