Moving a page tree with title conflicts between spaces in Confluence Server results in vague $error

Issue Summary

Moving a page tree with title conflicts between spaces in Confluence Server results in vague $error

Steps to Reproduce

move a page tree (parent and its children) from a regular space to a personal space (that isn't my own).

Expected Results

The error message should state that there are specific page title conflicts similar to...

Actual Results

vague $error message. `$error` messages show when moving the parent page and there are title conflicts, but the error message shown does not say that directly

Notes

There are two ways of getting the list of pages that already exist with the same title on the destination space:

1. Use the Copy Page Hierarchy instead of Move page,
2. Or, get a HAR file while hitting the Move button and inspect the movepage.action request, the Response Content will contain the list of duplicate page titles