fixed null exception
Merge branch 'master' of https://github.com/junysz/ProMusicaInventorySystem

Conflicts:
	src/com/group8/controller/Controller.java
	src/com/group8/view/ReportPanel.java
Merge branch 'master' of https://github.com/junysz/ProMusicaInventorySystem

Conflicts:
	src/com/group8/controller/Controller.java
	src/com/group8/view/ReportPanel.java