Issue #3102 - Converts output of subprocess to str in _pexpect_out

[aidin36]

The issue

Issue #3102

The fix

Output of subprocess.after is not always a str, and cannot be concatenate to str. This PR converts the variable to str before concatenation.

The checklist

• Associated issue
• A news fragment in the news/ directory to describe this fix with the extension .bugfix, .feature, .behavior, .doc. .vendor. or .trivial (this will appear in the release changelog). Use semantic line breaks and name the file after the issue number or the PR #.

[aidin36]

The error only happening in the master branch and not released yet, so I'm not sure if I should include a file in news.

[techalchemy]

Hey there. Thanks for the PR. Things in the vendor folder unfortunately need to be modified with a corresponding patch or they will be dropped when we re-vendor the dependencies. For this specific case however the output it is giving in addition to strings is type instance which is an EOF object and can’t be stringified. There is an open PR in delegator and a corresponding one here to fix these issues

Thanks for the PR!