OData link generation broken for singletonSegment/navPropSegment/KeySegment paths

[stephenjust]

When generating a link to an OData resource, the link is generated incorrectly if the model is in the structure of a singleton containing a contained navigation property to an entity set.

Assemblies affected

OData.WebAPI 7.4.0 OData.WebAPI 7.5.15

Reproduce steps

See the test case here: https://github.com/stephenjust/WebApi/commit/e65b6c4efe62feafee919a11d20b1d75462946ec

Expected result

Test case output should be "http://localhost/MyNextOrder/OrderLines(21)/OrderLines"

Actual result

Test case output is "http://localhost/(21)/OrderLines"

[stephenjust]

This issue is still present in 7.5.15

[mikepizzo]

Hi @xuzhg -- could you take a look into this issue?