Fix the `NA` runCommand that doesn't work as advertised #131

Annotations

6 errors and 2 warnings

use of NULL environment is defunct

Test failures

running the tests in ‘testthat.R’ failed

Failure in `/home/runner/work/_temp/package/babelmixr2/babelmixr2-tests/testthat.Rout.fail`

Process completed with exit code 1.

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