Update generated code: List responses return empty list instead of null#4104

chingor13 merged 17 commits intogoogleapis:mastergoogleapis/google-cloud-java:masterfrom

chingor13:pr-merge-4078-4076-4075-4074-4073-4072-4070-4068-4067-4066-4065-4064-4063-4062-4061-4060-4059chingor13/google-cloud-java:pr-merge-4078-4076-4075-4074-4073-4072-4070-4068-4067-4066-4065-4064-4063-4062-4061-4060-4059Copy head branch name to clipboard