DYN-9845 : handle invalid input

[BogdanZavu]

Purpose

Handle invalid input. The context here is that the Assistant can push invalid values sometimes ( e.g. when trying to set a Revit category ).

Declarations

Check these if you believe they are true

• Is documented according to the standards
• The level of testing this PR includes is appropriate
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.

Release Notes

N/A

Reviewers

@DynamoDS/synapse

[github-actions]

See the ticket for this pull request: https://jira.autodesk.com/browse/DYN-9845

[Copilot]

Pull request overview

This PR adds input validation to prevent exceptions when parsing invalid index values in dropdown nodes. The change addresses an issue where the Dynamo Assistant can occasionally push invalid values (such as when setting Revit categories), which previously caused Convert.ToInt32 to throw an exception.

Key Changes:

• Replaced Convert.ToInt32 with int.TryParse to safely handle invalid string inputs without throwing exceptions

[Copilot]

The early return when parsing fails should be documented with a comment explaining why the current selectedIndex is preserved for invalid inputs. This helps clarify the intended behavior when the Assistant pushes invalid values.

Suggested change

	{
	{
	// If parsing fails, return the current selectedIndex (-1 by default).
	// This preserves the current selection for invalid inputs, such as when the Assistant pushes invalid values.

[johnpierson]

this looks good to me. with a rebase it should be good.