Fix #1872

[JBGruber]

Fix #1872

[t-kalinowski]

Thank you for the PR! This looks like the right fix to my eyes.

Would you be able to add a snapshot/regression test that tests the happy path (no error), and also, captures the new error? Something like:

reticulate/tests/testthat/test-py_require.R

Line 19 in 0ce0b74

expect_snapshot2(r_session({

test_that("....", {
  local_edition(3)

  expect_snapshot2(r_session({
    library(reticulate)
    py_require(....)
    import("sys") # force python initialize
    py_require(....) # happy path
    py_require(....) # new error 
  })
 )
})

[JBGruber]

Thanks @t-kalinowski. Please take a look if this is what you had in mind.