Java codegen for list methods should not generate null checks like this one for proto fields https://github.com/googleapis/java-pubsublite/blob/da98b0f8212d33ace2e3f9d034f7a923ef05c43a/google-cloud-pubsublite/src/main/java/com/google/cloud/pubsublite/v1/stub/AdminServiceStubSettings.java#L187

This is a hard blocker for pulling these libraries into the google codebase which has a compiler error for null checks on protobuf fields. Per https://developers.google.com/protocol-buffers/docs/reference/java-generated, java protobuf fields will never return null.

Environment details

• Programming language: Java
• OS: All
• Language runtime version: All
• Package version: All

Steps to reproduce

1. Write a java client library with a list request
2. Codegen adds redundant check