revdep tidytable test failure after new NULL replacement

[tdhock]

revdep checker says that #6167 caused a new test failure in revdep tidytable:

* checking tests ...
  Running ‘testthat.R’
 ERROR
Running the tests in ‘tests/testthat.R’ failed.
Last 13 lines of output:
  The following object is masked from 'package:base':
  
      %in%
  
  > 
  > test_check("tidytable")
  [ FAIL 1 | WARN 0 | SKIP 0 | PASS 1335 ]
  
  ══ Failed tests ════════════════════════════════════════════════════════════════
  ── Failure ('test-pivot_longer.R:229:3'): can drop the 'id' column by specifying NA ──
  Names of `out` ('.id', 'x', 'y') don't match 'x', 'y'
  
  [ FAIL 1 | WARN 0 | SKIP 0 | PASS 1335 ]
  Error: Test failures

I verified on my local machine, and proposed a fix in tidytable, markfairbanks/tidytable#831