- fixed bug in fileupload

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

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

...java/unipotsdam/gf/modules/assessment/AssessmentView.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