pylero fails with "normId is invalid: /default/${Project}'" when missing default project argument

[KwisatzHaderach]

Running pylero with defined env variables POLARION_PASSWORD, POLARION_USERNAME, POLARION_REPO and POLARION_URL fails with nasty exception:

[0 13:07:48 pmatyas@pmatyas-fedora ~]$ pylero
Traceback (most recent call last):
...
During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/pmatyas/.local/bin/pylero", line 85, in <module>
    main()
  File "/home/pmatyas/.local/bin/pylero", line 75, in main
    imp_mod = __import__("pylero.{0}".format(the_mod), fromlist=[""])
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pmatyas/.local/lib/python3.11/site-packages/pylero/build.py", line 8, in <module>
    from pylero.build_linked_work_item import ArrayOfBuildLinkedWorkItem
  File "/home/pmatyas/.local/lib/python3.11/site-packages/pylero/build_linked_work_item.py", line 9, in <module>
    from pylero.work_item import _WorkItem
  File "/home/pmatyas/.local/lib/python3.11/site-packages/pylero/work_item.py", line 1582, in <module>
    vals = bp.get_valid_field_values("workitem-type")
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pmatyas/.local/lib/python3.11/site-packages/pylero/base_polarion.py", line 1052, in get_valid_field_values
    enums = self.session.tracker_client.service.getEnumOptionsForIdWithControl(
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pmatyas/.local/lib/python3.11/site-packages/suds/client.py", line 586, in __call__
    return client.invoke(args, kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pmatyas/.local/lib/python3.11/site-packages/suds/client.py", line 728, in invoke
    result = self.send(soapenv, timeout=timeout)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pmatyas/.local/lib/python3.11/site-packages/suds/client.py", line 776, in send
    return self.process_reply(content, e.httpcode, tostr(e))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pmatyas/.local/lib/python3.11/site-packages/suds/client.py", line 840, in process_reply
    raise WebFault(fault, replyroot)
suds.WebFault: Server raised fault: 'java.lang.IllegalArgumentException: normId is invalid: /default/${Project}'

Instead of clean fail mentioning missing POLARION_PROJECT

Same behaviour when missing default_project argument from .pylero config