ID 353203 - An OSError is returned when exporting a session via mari.session.exportSession()

Problem summary
An OSError is returned when exporting a session via mari.session.exportSession().

Customer reported version
4.0v4
Customer reported platform
centos7

Steps to reproduce

1) Open the affected archive

2) In the Python Console, run the following

exportDir = '/tmp/bandage'
geo = mari.geo.find('Bandage')
patch = geo.patch(50)
mari.session.exportSession(exportDir, geoEntities=[geo],
geoPatches=[patch], projectors=[] )

3) An OS Error is returned

Traceback (most recent call last):
File "<string>", line 5, in <module>
File /path/to/session/__init__.py", line  410, in exportSession
finishedCallback=finishedCallback).start()
File "/path/to/export_session.py",  line 493, in start
os.makedirs(nodegraphExportSubDir)
File "/path/to/os.py", line 157, in makedirs
mkdir(name, mode)
OSError: [Errno 17] File exists: '/path to file/{8452e952-eb7e-4013-b378-a2a006502275}'

Workaround
Unknown. 

Reproduced by support
Mari 4.0v4 - Win 10, CentOS 7.5
Mari 4.0v1
Mari 3.3v1
Mari 3.2v1 - Win 10, CentOS 7.5

Earliest version tested
Last working version - Mari 3.1v3

Expected behaviour
The script should run with no errors and export the session images

Actual behaviour
An OS Error is returned in the Python Console