Fix optional query param parsing

[czechboy0]

Motivation

Fixes apple/swift-openapi-generator#249.

Modifications

Adds a decodeIfPresent method on URIDecoder now used by the optional query param getter.

Result

This makes the query param getter return nil instead of throwing an error when it encounters a missing optional query param.

Test Plan

Added new unit tests, hopefully these cover it now.

[czechboy0]

@swift-server-bot test this please

[tib]

Looks good to me. Thank you for the fix.

[czechboy0]

@swift-server-bot test this please

[czechboy0]

@tib thanks for the review. Have you also had a chance to try this branch to verify the issue is fixed for the cases you tested?

[czechboy0]

@swift-server-bot test this please

[tib]

@tib thanks for the review. Have you also had a chance to try this branch to verify the issue is fixed for the cases you tested?

Yes, I was able to verify it and the fix works just fine. If you could release this as a patch (0.2.1?) that'd be so nice. Thank you very much for the help. 🙏

[czechboy0]

@tib thanks for the review. Have you also had a chance to try this branch to verify the issue is fixed for the cases you tested?

Yes, I was able to verify it and the fix works just fine. If you could release this as a patch (0.2.1?) that'd be so nice. Thank you very much for the help. 🙏

Will do, just wanted to make sure we really addressed the issue first. Thanks for the confirmation 🙏