Proper error handling of convert engine command when file does not exist

[hschilling]

Summary

The current behavior is that if a user does this command and the file turbofan_23k_1.eng does not exist in the current working directory

aviary convert_engine turbofan_23k_1.eng turbofan_23k_1.csv -f GASP

they get an error

File "/Users/hschilli/Documents/OpenMDAO/dev/IA1004-convert-engine-error-message/aviary/utils/engine_deck_conversion.py", line 452, in _read_header
    iread, iprint, wamap, t4max, t4mcl, t4mc, sfnidl = _parse(
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/hschilli/Documents/OpenMDAO/dev/IA1004-convert-engine-error-message/aviary/utils/conversion_utils.py", line 25, in _strparse
    yield typ(sub)
          ^^^^^^^^
ValueError: invalid literal for int() with base 10: '# cre'

This is because behind the scenes, Aviary searches for the file turbofan_23k_1.eng and any files "like" it to use as the input file. It finds

aviary/models/engines/turbofan_23k_1.csv

and tried to convert that, which fails.

This PR changes that behavior by not searching for a similar file. If the file requested does not exist, the user gets an error message saying it doesn't exist and the command fails.

Related Issues

• Resolves aviary convert_engine needs better error message when input deck file does not exist #1004

Backwards incompatibilities

None

New Dependencies

None

[Kenneth-T-Moore]

Looks good, but probably should add a test for the two new error messages.