"The Python interpreter can't be found" error when running `pipenv install --system` with a python3 but no python

[jfly]

Issue description

I get a "The Python interpreter can't be found" error when running pipenv install --system with a python3 but no python.

Demo:

$ docker run $(docker build -q -f Dockerfile.pipenv-2022.8.15 https://github.com/jfly/2022-08-16-pipenv-system-which-issue.git#main)
Installing dependencies from Pipfile.lock (63bec0)...
The Python interpreter can't be found.▉ 0/4 — 00:00:00
  🐍   ▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉ 0/4 — 00:00:00

I'm confident this bug was introduced in f276360, which removed a usage of first(), but broke the "filter None values" behavior that first() gave us.

[schuberttobias]

Thanks for your report.

I am also running into this problem with python3.8 and pipenv==2022.8.15 .