Treat missing dependencies as no dependencies

[Desarc]

This resolves #4319.

I'm not sure how I would add a test for this, or if it can cause issues in other contexts. I have tested with both of the versions of JFrog Artifactory we are using, and a few different packages, and there were no issues. I also tested with https://api.nuget.org/v3/index.json, same result.

Please let me know if there are other cases that should be tested, if I need to add something to the test suite, or if there are other things to consider with this change.

[dsyme]

/repo-assist please add a test for this

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/repo-assist please add a test for this

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I've added a unit test covering this change: can parse package without Dependencies node as no dependencies in tests/Paket.Tests/NuGetOData/ODataSpecs.fs, using a new fixture (NoDependenciesNode.xml, an OData entry without the <d:Dependencies> element, modeled on JFrog Artifactory's response shape). It asserts the parsed package has an empty dependency list instead of throwing.

Ran locally with dotnet test tests/Paket.Tests/Paket.Tests.fsproj --filter "FullyQualifiedName~ODataSpecs" — all 12 tests pass on net9 (net461 run couldn't execute due to a missing mono host in this environment, unrelated to the change).

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[dsyme]

/repo-assist Please make a new PR with the same contents as this PR but adding a test.

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