Bug correction importing some empty fileds
add .dtd file validator creation in module export
Code optimisation deal with .dtd
bug Correction : deal with empty fields in export operation
Debuging error with empty field
Debuging:  deal with empty fields
Reformatting Code Pull request #138
Debuging:  deal with empty fields
del unused var
deal with blank lines git difference
Merge pull request #138 from smirfolio/feature/study-export

Bug correction importing some empty fileds