Merge pull request #1140 from wp-cli/fix-1140

Widget Add - Warning: array_slice() expects parameter 1 to be array
Merge pull request #1205 from mboynes/patch-1

Fixing typo in menu bulk deleting
Merge pull request #1187 from wp-cli/fix-db-export-no-charset

Support empty `DB_CHARSET` value when running MySQL commands