Revit_Core_Engine: Handle null exception on Nurbs curves in element boundaries

[vietle-bh]

NOTE: Depends on

Issues addressed by this PR

Closes #1290

Revit elements with nurbs curves in their boundaries will fail to pull with the message "Outline isn't closed" message. This PR handles another error this exception then triggers.

Test files

On SharePoint

Changelog

• Remove the irrelevant error message due to the same error thrown twice.

[vietle-bh]

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[pawelbaran]

The fix itself makes sense to me and will improve the UX of the adapter - however, please have a look at my comment under the issue before merging.

[pawelbaran]

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[bhombot-ci]

Please be advised that the check with reference 10063178213 has more than 50 annotations of notes. API limitations restrict annotations to 50. You may need to rerun this check to obtain the next set when you make changes. At the time of reporting this check, there are 266 additional annotations waiting, made up of 266 errors and 0 warnings.

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[vietle-bh]

Another failed Installer check although Versioning has passed 😱
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[pawelbaran]

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