Exceptions

[polortiz4]

Try testing multiple ways people could break our webpage and add exceptions for that. Quick examples thay come to mind: -Trying to create a user whose username already exist. (I wrote something for this in main.py, but it isn't great... worth checking) -Inputting some file of unexpected format -Trying to create a user without filling out all the fields.

Thought of a new one that's giving errors:

• Clicking The Get Prediction button before the Choose and Image Button
• Pressing the Home button before get predictions has finished running (this one I guess is more optional)

[epvienneau]

almost broke the app, but its done...