Ensure that we properly handle all sorts of broken inputs

[nikku]

TLDR: When using the utility users must not accidentally swallow errors or warnings.

What should we do?

Our dmn-js toolkit does, out of the box, handle all sorts of broken input with appropriate error messages during import:

• binary files (e.g. images)
• non-DMN text files

Expected Behavior

• Ensure that the migration utility is en par and handles the issues in the same way.
• Ensure that the migration utility handles warnings appropriately.

Why should we do it?

We advertise the migration utility as a pre-processing step before using dmn-js@8.0.0.

diagramXML -> dmn-migrate -> dmn-js#importXML

In order for that to properly work we must handle errors and warnings appropriately.

[philippfromme]

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