Replace @Nullable annotations with @Nonnull in BaseRequestBuilder

[mspiess]

Fixes #783

Changes proposed in this pull request

• Replacing faulty @Nullable annotation with correct @Nonnull annotations

[baywet]

Thanks for the contribution.
Can you add an entry in the changelog (new patch bump, date it to tomorrow, add the change in changed)
as well a bump the patch in gradle.properties please?
https://github.com/microsoftgraph/msgraph-sdk-java-core/blob/dev/gradle.properties
https://github.com/microsoftgraph/msgraph-sdk-java-core/blob/dev/CHANGELOG.md

[mspiess]

@microsoft-github-policy-service agree

[baywet]

Thanks for making the changes.

[mspiess]

Project not found. Please check the 'sonar.projectKey' and 'sonar.organization' properties, the 'SONAR_TOKEN' environment variable, or contact the project administrator

Is there anything I can do about this?

[baywet]

no sorry for forgetting about this PR and thanks for the nudge