LIVE-2186 - Bugfix: fix sending last NFT crash

[lambertkevin]

🦒 Context (issues, jira)

https://ledgerhq.atlassian.net/browse/LIVE-2186

🖤 Expectations to reach

PR must pass CI, rebase develop if conflicts. Thanks!

• on QA: at least one of these two checkboxes must be checked:
  • [ ] a specific test planned is defined on Jira
  • [ ] this PR is covered by automatic UI test
• on delivery: at least one of these two checkboxes must be checked:
  • [x] Option 1: no impact: The changes of this PR have ZERO impact on the userland (invisible for users)
  • [ ] Option 2: atomic delivery: the changes is atomic and complete (no partial delivery)