catch AttrbuteError on typing imports from ironpython

[chenkasirer]

Not sure what has changed because these imports aren't new, but started getting AttributeError on these typing imports from ironpython.

IronPython 2.7.8 (2.7.8.0) on .NET 4.0.30319.42000 (64-bit)
Type "help", "copyright", "credits" or "license" for more information.
>>> from compas.data import Data
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\ckasirer\repos\compas\src\compas\__init__.py", line 16, in <module>
  File "C:\Users\ckasirer\repos\compas\src\compas\data\__init__.py", line 9, in <module>
  File "C:\Users\ckasirer\repos\compas\src\compas\data\encoders.py", line 13, in <module>
  File "C:\Users\ckasirer\repos\compas\src\compas\data\data.py", line 6, in <module>
  File "C:\Program Files\IronPython 2.7\Lib\site-packages\typing.py", line 2061, in <module>
  File "C:\Program Files\IronPython 2.7\Lib\abc.py", line 109, in register
  File "C:\Program Files\IronPython 2.7\Lib\site-packages\typing.py", line 1410, in __subclasscheck__
  File "C:\Program Files\IronPython 2.7\Lib\abc.py", line 154, in __subclasscheck__
  File "C:\Program Files\IronPython 2.7\Lib\site-packages\typing.py", line 1290, in _abc_negative_cache_version
AttributeError: 'GenericMeta' object has no attribute '_abc_generic_negative_cache_version'

What type of change is this?

• Bug fix in a backwards-compatible manner.
• New feature in a backwards-compatible manner.
• Breaking change: bug fix or new feature that involve incompatible API changes.
• Other (e.g. doc update, configuration, etc)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• I added a line to the CHANGELOG.md file in the Unreleased section under the most fitting heading (e.g. Added, Changed, Removed).
• I ran all tests on my computer and it's all green (i.e. invoke test).
• I ran lint on my computer and there are no errors (i.e. invoke lint).
• I added new functions/classes and made them available on a second-level import, e.g. compas.datastructures.Mesh.
• I have added tests that prove my fix is effective or that my feature works.
• I have added necessary documentation (if appropriate)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 61.86%. Comparing base (ea17a24) to head (c57044b).

Files with missing lines	Patch %	Lines
src/compas/data/data.py	0.00%	1 Missing ⚠️
src/compas/data/encoders.py	0.00%	1 Missing ⚠️
src/compas/datastructures/datastructure.py	0.00%	1 Missing ⚠️
src/compas/geometry/geometry.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1454      +/-   ##
==========================================
- Coverage   61.87%   61.86%   -0.02%     
==========================================
  Files         208      208              
  Lines       22329    22329              
==========================================
- Hits        13817    13813       -4     
- Misses       8512     8516       +4     

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[tomvanmele]

are we still certain this change is needed and that the error was not triggered by something else?