fix: ignoring empty files in mp_hashdirectory. Closes #314

[allanbowe]

Issue

314

Intent

Ignoring empty files in mp_hashdirectory() as these break the m6 HASHING_FILE function

Implementation

opened each file as part of the data step loop to confirm that it contains content

Checks

• [x] Code is formatted correctly (sasjs lint).
• [x] Any new functionality has been unit tested.
• [x] All unit tests are passing (sasjs test).

[gitpod-io[bot]]

[sasjsbot]

:tada: This PR is included in version 4.40.1 :tada:

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