Added error-handling to CSVHandler. CSVHandler throws an
UnsupportedOperationException with a fitting message that can be caught.
Replaced string comparison with == by string comparison with equals
Added parent header to csv.
Added error handling for the case that a student dataset does not
contain any parent information.
Inserted parent-testdata into csv.
Changed header name "Erz1StraßeNr" to "Erz1StrasseNr"
Added check for NumberFormatException to check if the postalcode is a
number. Changed postalcode in csv from "Test" to "1".
Changed propertyname from "Erz1StraßeNr" to "Erz1StrasseNr"
Replaced generic and deprecated code in PrintingComponent.
Merge pull request #302 from B3nRa/issue#184

Added error-handling to CSVHandler. CSVHandler throws an