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Purpose

DYN-1195
Dropdown nodes can fail to maintain previous selection in Dynamo Player.

This PR fixes an edge case that when parsing selection which contains special characters in XML doc like &, <, >, etc, our code failed catch the exception causing unescaping to fail silently.

For example, Revit Fill Pattern selection contains which contains invalid XML string when parsing. Internally, we escape this string to be

"0:<Solid fill>"

After unescaping, the string will went back to

"0:<Solid Fill>"

Behavior after bug fixing

TODO:

• Unit Tests

Declarations

Check these if you believe they are true

• The code base is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning, and are documented in the API Changes document.

Reviewers

@mjkkirschner @aparajit-pratap

FYIs

@BogdanZavu @dobriai