FIX: ISXB-1153 fix exception on paste to empty actionmap list

[smnwttbr]

Description

Fixed an exception when pasting an action map into an empty action map list. ISXB-1150

Testing status & QA

local package tests succeeded.

Overall Product Risks

• Complexity: low
• Halo Effect: small

Comments to reviewers

Please describe any additional information such as what to focus on, or historical info for the reviewers.

Checklist

Before review:

• Changelog entry added.
  • Explains the change in Changed, Fixed, Added sections.
  • For API change contains an example snippet and/or migration example.
  • JIRA ticket linked, example (case %%). If it is a private issue, just add the case ID without a link.
  • Jira port for the next release set as "Resolved".
• Tests added/changed, if applicable.
  • Functional tests Area_CanDoX, Area_CanDoX_EvenIfYIsTheCase, Area_WhenIDoX_AndYHappens_ThisIsTheResult.
  • Performance tests.
  • Integration tests.
• Docs for new/changed API's.
  • Xmldoc cross references are set correctly.
  • Added explanation how the API works.
  • Usage code examples added.
  • The manual is updated, if needed.

During merge:

• Commit message for squash-merge is prefixed with one of the list:
  • NEW: ___.
  • FIX: ___.
  • DOCS: ___.
  • CHANGE: ___.
  • RELEASE: 1.1.0-preview.3.

After merge:

• Create forward/backward port if needed. If you are blocked from creating a forward port now please add a task to ISX-1444.

[Pauliusd01]

Getting an "Invalid action index to insert bindings before." error when pasting an action to an empty action list (does not occur on stable)

1730361545.TrunkInputSystem_-_MouseVisualizer_-_Windows._Mac.mp4

[Pauliusd01]

Just updating status

[Pauliusd01]

LGTM, found 2 more paste related bugs but they're not regressions so will file those separately. Checked: cut/copy pasting maps, actions and bindings between assets when they're empty, have assets, when the thing I'm cutting is the last on the list, when the actions/maps aren't saved yet in either asset (all with shortcuts and context menu). Also, undo/redo workflow and auto save behaviour.