Potential stability issues in the application

[jonahschueller]

This issue is a collection of potential stability issues in the app.

Please check all the items that have been tests and attach the date when it was tested.

• Wrong file type
• No file selected (cancel file choosing) ??
• Load new event log
• Reset event log
• Clear event log
• Upload corrupt event log
• Missing concept:name attribute in certain traces
• Move nodes out of the window

[jonahschueller]

Break the frontend with broken files