Show BarErrorDecorator in export

[fpottbaecker]

The working BarErrorDecorator was not shown in the export.

I tested it manually and it seems to work quite well.
Further, there are no tests for other exported decorators, so i did not write any for this decorator.

[google-cla]

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[fpottbaecker]

@googlebot I signed it!

[stuartmorgan]

This project is no longer maintained, and cannot accept any PRs. Community members interested in collaborating on a community-maintained fork can coordinate in this issue.