Fixes the constraint violation error in DestroyDataseCommand (3875)

[landreev]

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Related Issues

• connects to Internal Server Error (500) when destroying a dataset: foreign key constraint "fk_dataset_thumbnailfile_id" on table "dataset" #3875: Internal Server Error (500) when destroying a dataset: foreign key constraint "fk_dataset_thumbnailfile_id" on table "dataset"

Pull Request Checklist

• Unit tests completed
• Integration tests: None
• Deployment requirements, SQL updates, Solr updates, etc.: None
• Documentation completed
• Merged latest from "develop" branch and resolved conflicts

[pdurbin]

As of 0ecdd35 all of the tests in DatasetsIT.java pass. Looks like a good fix. Approved.

[coveralls]

Coverage decreased (-0.0002%) to 10.039% when pulling 0ecdd35 on 3875-destroy-dataset-thumbnail-datafile-constraint into f6441f8 on develop.