[sr-dev] [kamailio/kamailio] python3: `PyErr_SetString` is a void function. It doesn't return NULL. (PR #3231)

[Matthias Urlichs]

#### Pre-Submission Checklist
- [x] Commit message has the format required by CONTRIBUTING guide
- [x] Commits are split per component (core, individual modules, libs, utils, ...)
- [ ] Each component has a single commit (if not, squash them into one commit)
- [ ] No commits to README files for modules (changes must be done to docbook files
in `doc/` subfolder, the README file is autogenerated)

#### Type Of Change
- [ ] Small bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds new functionality)
- [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist:
- [ ] PR should be backported to stable branches
- [ ] Tested changes locally
- [ ] Related to issue #XXXX (replace XXXX with an open issue number)

#### Description

`PyErr_SetString` is a void function. It doesn't return NULL.

You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/3231

-- Commit Summary --

  * Python: must return NULL on error, not Py_None
  * modules/python3: return NULL on error.

-- File Changes --

    M src/modules/app_python3/python_msgobj.c (102)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/3231.patch
https://github.com/kamailio/kamailio/pull/3231.diff

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