fix(model): make sure post save error handler gets doc as param on VersionError

[vkarpov15]

Fix #15480

Summary

Quick fix - apparently need callback(err, this), callback(err) means a null result gets passed to error handling middleware.

Examples

[Copilot]

Pull Request Overview

This pull request fixes issue #15480 by ensuring that the post-save error handler receives the document as a parameter when a VersionError is encountered.

• In lib/model.js, the error callback in the $__save function now passes the document (this) along with the error.
• A corresponding test case has been added in test/model.middleware.test.js to verify that the post-save error handler is called with the proper parameters.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
test/model.middleware.test.js	Adds a test case to confirm that the post-save error handler receives the doc param.
lib/model.js	Modifies the error callback to pass the document along with the error for VersionError.