Unhelpful message with custom script errors - `AttributeError:'NoneType' object has no attribute 'full_name'`

[candlerb]

Deployment Type

Self-hosted

NetBox Version

v3.7.3

Python Version

3.8

Steps to Reproduce

1. Create a local file called wombat.py

   from extras.scripts import Script
   
   class Possum(Script):
       def run(self, data, commit):
           pass
   

2. Upload this as a custom script via the web UI

3. Test at CLI: /opt/netbox/venv/bin/python /opt/netbox/netbox/manage.py runscript wombat.Possum

4. Edit the file /opt/netbox/netbox/scripts/wombat.py on the Netbox server. Change "def" to "defz" (a gross syntax error)

5. Re-run same CLI command: /opt/netbox/venv/bin/python /opt/netbox/netbox/manage.py runscript wombat.Possum

Expected Behavior

A useful error message, such as

  File "/opt/netbox/netbox/scripts/wombat.py", line 4
    defz run(self, data, commit):
         ^
SyntaxError: invalid syntax

Observed Behavior

A confusing error message:

# /opt/netbox/venv/bin/python /opt/netbox/netbox/manage.py runscript wombat.Possum
Traceback (most recent call last):
  File "/opt/netbox/netbox/manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/opt/netbox/venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 442, in execute_from_command_line
    utility.execute()
  File "/opt/netbox/venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 436, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/opt/netbox/venv/lib/python3.8/site-packages/django/core/management/base.py", line 412, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/opt/netbox/venv/lib/python3.8/site-packages/django/core/management/base.py", line 458, in execute
    output = self.handle(*args, **options)
  File "/opt/netbox/netbox/extras/management/commands/runscript.py", line 95, in handle
    logger = logging.getLogger(f"netbox.scripts.{script.full_name}")
AttributeError: 'NoneType' object has no attribute 'full_name'

Additional Reproducers

It's also possible to reproduce this problem without a syntax error:

• After from extras.scripts import Script, add a line import foo from bar. OR:
• Change the class name "Possum" to "Dingo"

Then re-run the exact same CLI command: /opt/netbox/venv/bin/python /opt/netbox/netbox/manage.py runscript wombat.Possum

The errors I'd expect would be along the lines of:

Traceback (most recent call last):
  File "/opt/netbox/netbox/scripts/wombat.py", line 2, in <module>
    from foo import bar
ModuleNotFoundError: No module named 'foo'

or

AttributeError: module 'wombat' has no attribute 'Possum'

But instead, these both still give AttributeError: 'NoneType' object has no attribute 'full_name'

References

Relates to discussion #15352 and issue #12766