Properly handle the error when a contour with a wrong model is being computed

[ahaselsteiner]

I'm submitting a ...

• [x] bug report
• [ ] feature request
• [ ] code improvement request

Expected behavior

How should it work (with the bug fixed or the feature implemented)? The user should be presented with a proper error message.

Screenshot

Actual behavior

How does it currently work (with the bug causing problems or without the feature)? Locally (with DEBUG=True) the error is shown in the view, with DEBUG=false probably the 500-error page would be shown.

Screenshot Model:

Contour settings:

Result:

Steps to reproduce the problem (how to see the actual behavior)

1. Create the problematic model (see screenshot)
2. Try to compute an IFORM contour with the given settings (see screenshot)
3. Get the error

[ahaselsteiner]

Since the error is currently not catched on heroku / in production this error leads to the following page:

[ahaselsteiner]

Input:

Error:

[ahaselsteiner]

Handling the case with infinity now:

[ahaselsteiner]

And for the the other case:

We now get this error message:

[ahaselsteiner]

Done.