Remove type submit from button_tag since default.
Typo indiciated -> indicated.
Replace empty? || nil? with blank?.
Merge pull request #7875 from cirosantilli/patch-6

Typo indiciated -> indicated.
Merge pull request #7877 from cirosantilli/empty-nil-blank

Replace empty? || nil? with blank?.
Merge pull request #7864 from cirosantilli/rm-default-type-submit

Remove type submit from button_tag since default.