django-import-export / django-import-export / 9582789724

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Improve Error class (#1882)

* Improve Error class

1. Lazily compute the traceback string, using `traceback.format_exception()`. It’s only used in the rare case that `"traceback"` is in the `import_error_display` attribute.
2. Add a nice `__repr__`, to help debug test failures that make assertions on `Error` objects. I had a few cases where tests failed with inscrutable messages from pytest like `Left contains one more item: <import_export.results.Error object at 0x3173c8690>`, and I needed to rerun the test with the debugger to inspect the inner exception.

* Update test_import.py

Removed extraneous bracket

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Co-authored-by: Matt Hegarty <matthewhegarty@users.noreply.github.com>

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