Remove unexpected :slug error on valid model, fixes #949

[caiofilipemr]

I believe this simple change solves the issue #949.

[parndt]

Thanks @caiofilipemr that looks like it could do the trick, but CI is failing for this change?

[giovannibonetti]

Hi, @parndt! I work with @caiofilipemr and we were looking into this together.

but CI is failing for this change?

After taking a closer look it seems like the few cases that failed are not related to these changes at all:

Can you run the tests again? It seems like the Coveralls configuration is a bit unstable.

[parndt]

After taking a closer look it seems like the few cases that failed are not related to these changes at all:

it also reports this failure: https://github.com/norman/friendly_id/pull/952/checks?check_run_id=1036629235#step:10:99

I'll re-run and see. It's failing on Rails 5.0 tests which leads me to believe it's related to Rails 5.

[parndt]

It seems like the Coveralls configuration is a bit unstable.

Sometimes I wonder if it's even a worthwhile measurement. 😄

[parndt]

Rather than fight CI, I've opened #954

[parndt]

@caiofilipemr can you pull in the latest changes to your branch please so that CI may pass?

[parndt]

Thanks!