pipeline for master branch always fails

failed test job output:

python run-test-pre: PYTHONHASHSEED='3162177189'
python run-test: commands[0] | mypy demessaging
demessaging/PulsarMessageConsumer.py:47: error: Argument "value" to "BoundedSemaphore" has incompatible type "Optional[Any]"; expected "int"
demessaging/backend/function.py:158: error: Argument 1 to "parse" has incompatible type "Optional[str]"; expected "str"
Found 2 errors in 2 files (checked 18 source files)
ERROR: InvocationError for command /builds/digital-earth/dasf/dasf-messaging-python/.tox/python/bin/mypy demessaging (exited with code 1)
___________________________________ summary ____________________________________
ERROR:   python: commands failed
Cleaning up file based variables
ERROR: Job failed: exit code 1