zip_size can be undefined

[awlong]

lambda-packager/python/entrypoint.py

Line 394 in 0132532

if variables['fail_on_too_big'] and zip_size > variables['max_lambda_size']:

if the shutil.make_archive call fails (due to a multiprocessing race condition on mkdir), the process will throw out of the initial try/catch block and then throw again which blocks a return code from being captured by the Process.

Need to either check the process exitcode when joining or account for that undefined zip_size and return a breaking error code