- fixed bug in fileupload

...c/main/java/unipotsdam/gf/config/GFApplicationBinder.java

.../java/unipotsdam/gf/modules/assessment/AssessmentDAO.java

.../unipotsdam/gf/modules/assessment/AssessmentProgress.java

...ipotsdam/gf/modules/fileManagement/FileManagementDAO.java

...ain/java/unipotsdam/gf/process/PeerAssessmentProcess.java

...en/src/main/java/unipotsdam/gf/process/tasks/TaskDAO.java

...n/src/main/java/unipotsdam/gf/process/tasks/TaskName.java

...rschen/src/main/webapp/assessment/js/assessmentService.js

gemeinsamforschen/src/main/webapp/project/js/tasks.js

gemeinsamforschen/src/main/webapp/project/tasks-docent.jsp

...a/unipotsdam/gf/modules/assessment/TestAddAssessment.java

gemeinsamforschen/src/test/resources/database/fltrail.sql