is_native doesn't handle the TypeError case from os.path.dirname.

[ahaberlach]

Describe the bug

"is_native" check seems to be failing to catch TypeError which is returned by os.path.dirname(None)

I was running into this while profiling some native code, and it may be a python 3.8 or older system issue.

"~/.virtualenv/production/lib/python3.8/site-packages/scalene/scalene_analysis.py" 137L, 5125C                                                                          23,13         Top
  File "/home/ubuntu/.virtualenv/production/lib/python3.8/site-packages/scalene/scalene_profiler.py", line 932, in output_profile
    json_output = Scalene.__json.output_profiles(
  File "/home/ubuntu/.virtualenv/production/lib/python3.8/site-packages/scalene/scalene_json.py", line 393, in output_profiles
    imports = ScaleneAnalysis.get_native_imported_modules(code_str)
  File "/home/ubuntu/.virtualenv/production/lib/python3.8/site-packages/scalene/scalene_analysis.py", line 93, in get_native_imported_modules
    if ScaleneAnalysis.is_native(node.module):
  File "/home/ubuntu/.virtualenv/production/lib/python3.8/site-packages/scalene/scalene_analysis.py", line 23, in is_native
    package_dir = os.path.dirname(package.__file__)
  File "/usr/lib/python3.8/posixpath.py", line 152, in dirname
    p = os.fspath(p)
TypeError: expected str, bytes or os.PathLike object, not NoneType

I fixed/worked around by adding the check for TypeError to scalene_analysis.py. I've got a PR on the way.

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[emeryberger]

I believe this is fixed. Please let me know either way!