The commit is:
https://github.com/hibernate/hibernate-orm/commit/ee2dd0ddf5d42ff5343a97bfb7e4a7938ab36eec#L5L256

In execute() is a check if output==None. In this case nothing is done. This is wrong because outputFile must also be checked. The correct check is:

if ( (output == Target.NONE && outputFile==null) || type == SchemaExport.Type.NONE ) {
...