Modal editor asset selection can cause orphaned courseassets

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Expected Behaviour

courseassets collection for a given course should accurately reflect the assets used in the course,contentobject etc JSON.

Actual Behaviour

Selecting an asset in the item modal widow and then canceling leaves the courseasset record resulting in unwanted assets being included in publish and export zip.

Steps to Reproduce

1. Add an accordion component to a course
2. add an item and select an asset
3. courseasset record is created in DB
4. In the item modal window click cancel
5. courseasset record is not removed from DB even though the accordion component has not selected asset.

Versions

• Authoring Tool Version: v0.8.1
• Framework Version: v2.5
• Node.js Version: n/a
• MongoDB Version: n/a
• Operating System: n/a
• Browser: n/a