Exporting a product causes unsaved changes indicator and reset changes button to appear

[mohsin-r]

Description

What the title says.

Environment

All.

Steps to reproduce

1. Load your favourite product.
2. Go to main editor tab.
3. Hit export without making any changes.
4. Get groused at for having unsaved changes.

Expected behavior

There should be no unsaved changes indicator/reset changes button.

Actual behavior

There is an indicator and a button.

[RyanCoulsonCA]

Same thing happens if you open the edit metadata modal and then click "View French Config".

One common function that's called in both of these cases is loadSlides(), which replaces the undefined slides with an empty object.

This slide change is getting picked up by onSlidesEdited in editor.vue, which fires any time this.slides is updated and sets unsavedChanges to true.