Fix IssueBundle and IssueAction structures

[ConstanceBeguier]

The vector of issue actions in an IssueBundle must not be empty.
The vector of notes in an IssueAction could be empty when finalize is set to true.

We could add some actions in an IssueAction even if finalize is set to true.
Only the next block is affected by the finalize flag, not the current block.

[what-the-diff]

PR Summary

• Enhanced issue_zsa_notes() function
  The function now accepts an asset description as a parameter for better flexibility.

• New unauthorized_asset variable and changes to IssueBundle::new() method
  The new variable stores results of an updated method that takes an additional argument, improving the creation of issue bundles.

• Removal of 'assert!' and improved error handling
  Assertions were replaced with 'if let Err(_err)' statements for more graceful failure handling during tests, preventing crashes and improving overall stability.

[PaulLaux]

added some comments.