Add a test case of nested empty array values in conditions

  Post.where(id: [[]]).to_a

Used to fail with a SQL syntax error (until 4.1):

  SELECT ... WHERE id in ();

It now properly generate:

  SELECT ... WHERE 1=0;
Merge pull request #16528 from byroot/add-test-case-for-nested-array-in-where-conditions

Add a test case of nested empty array values in conditions