NPE for LRO's with response type "google.protobuf.Empty" #441
Description
GAPIC generation on the googleads/v5 protos fails with a NPE when encountering an LRO with response_type: "google.protobuf.Empty".
Specifically, when GAPIC generation gets to googleads/v5/services/batch_job_service.proto:RunBatchJob, the following exception is thrown:
Exception in thread "main" java.lang.NullPointerException: LRO response message Empty not found on method RunBatchJob
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:895)
at com.google.api.generator.gapic.protoparser.Parser.parseLro(Parser.java:384)
at com.google.api.generator.gapic.protoparser.Parser.parseMethods(Parser.java:331)
at com.google.api.generator.gapic.protoparser.Parser.lambda$parseService$0(Parser.java:196)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
at com.google.api.generator.gapic.protoparser.Parser.parseService(Parser.java:199)
at com.google.api.generator.gapic.protoparser.Parser.parseServices(Parser.java:132)
at com.google.api.generator.gapic.protoparser.Parser.parse(Parser.java:103)
at com.google.api.generator.gapic.Generator.generateGapic(Generator.java:29)
at com.google.api.generator.Main.main(Main.java:35)
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