Used import statement from occ_utils.py
added an If-Statement to the GetObject()-call.
Calling SetSelectionPriority directly on ais, as proposed by aothms (https://github.com/IfcOpenShell/IfcOpenShell/issues/1098) did not work.
Could load some ifc-models but needs further testing.
```python
ifcopenshell/geom/occ_utils.py:28ifcopenshell/geom/occ_utils.py:28
/home/cyril/git/BIMxBEM/ifcopenshell/geom/occ_utils.py:28: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.9 it will stop working
from collections import namedtuple, Iterable
```
When running the viewer app in python3, I got the following crash:
Traceback (most recent call last):
File "geom_app.py", line 2, in <module>
ifcopenshell.geom.app.application().start()
File "/usr/lib/python3/dist-packages/ifcopenshell/geom/app.py", line 534, in __init__
self.editor = code_edit(self.canvas, configuration().options('snippets'))
File "/usr/lib/python3/dist-packages/ifcopenshell/geom/app.py", line 68, in __init__
config = Cfg()
TypeError: 'ConfigParser' object is not callable
Unify configparser usage for py2 and py3 by making sure the py3 path
also gives a callable Cfg
Andrej730