) (#2460)

Source-Link: googleapis/synthtool@349943b
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-java:latest@sha256:033161f610016d155d58f96769ad5a821d203824684e8a13fc50be8c25a5f9cf

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

…tected (#2460)

Fixes googleapis/sdk-platform-java#2050

Adds behavior to gracefully perform a NOOP if no services are contained
in the generation request.


## Confimation in hermetic build scripts

From `generate_library.sh` against `google/cloud/alloydb/connectors/v1`
```
+ /usr/local/google/home/diegomarquezp/Desktop/sdk2/sdk3/sdk-platform-java/library_generation/output/protobuf-25.2/bin/protoc --experimental_allow_proto3_optional --plugin=protoc-gen-java_gapic=/usr/local/google/home/diegomarquezp/.pyenv/versions/3.11.0/lib/python3.11/site-packages/library_generation/gapic-generator-java-wrapper --java_gapic_out=metadata:/usr/local/google/home/diegomarquezp/Desktop/sdk2/sdk3/sdk-platform-java/library_generation/output/temp_preprocessed/java_gapic_srcjar_raw.srcjar.zip --java_gapic_opt=transport=grpc,rest-numeric-enums,grpc-service-config=,gapic-config=,api-service-config=google/cloud/alloydb/connectors/v1/connectors_v1.yaml google/cloud/alloydb/connectors/v1/resources.proto google/cloud/common_resources.proto
Apr 05, 2024 9:33:22 PM com.google.api.generator.gapic.protoparser.Parser parse
WARNING: No services found to generate. This will produce an empty zip file
Apr 05, 2024 9:33:22 PM com.google.api.generator.gapic.composer.ClientLibraryPackageInfoComposer generatePackageInfo
WARNING: Generating empty package info since no services were found
+ did_generate_gapic=true
+ zipinfo -t /usr/local/google/home/diegomarquezp/Desktop/sdk2/sdk3/sdk-platform-java/library_generation/output/temp_preprocessed/java_gapic_srcjar_raw.srcjar.zip
Empty zipfile. 
+ did_generate_gapic=false
+ [[ false == \t\r\u\e ]]

```

I made some changes to library_generation but I moved them to a follow
up PR (googleapis/sdk-platform-java#2599) so the
checks can pass here.

🤖 I have created a release *beep* *boop*
---


<details><summary>2.42.0</summary>

##
[2.42.0](googleapis/sdk-platform-java@v2.41.0...v2.42.0)
(2024-06-25)


### Features

* Allow Adding Client Level Attributes to MetricsTracerFactory
([#2614](googleapis/sdk-platform-java#2614))
([e254528](googleapis/sdk-platform-java@e254528))
* gapic-generator-java to perform a no-op when no services are detected
([#2460](googleapis/sdk-platform-java#2460))
([1612391](googleapis/sdk-platform-java@1612391))
* Make Layout Parser generally available in V1
([30acafa](googleapis/sdk-platform-java@30acafa))
* populate `.repo-metadata.json` from highest version
([#2890](googleapis/sdk-platform-java#2890))
([3bca9a4](googleapis/sdk-platform-java@3bca9a4))
* push SNAPSHOT versions of the hermetic build docker image
([#2888](googleapis/sdk-platform-java#2888))
([8bc060b](googleapis/sdk-platform-java@8bc060b))


### Bug Fixes

* **deps:** update the Java code generator (gapic-generator-java) to
1.2.3
([30acafa](googleapis/sdk-platform-java@30acafa))
* Expose Gax meter name
([#2865](googleapis/sdk-platform-java#2865))
([2095f4a](googleapis/sdk-platform-java@2095f4a))
* Move the logic of getting systemProductName from static block to
static method
([#2874](googleapis/sdk-platform-java#2874))
([cf67770](googleapis/sdk-platform-java@cf67770))
* Update default Otel Attribute from method_name to method
([#2833](googleapis/sdk-platform-java#2833))
([a88fdde](googleapis/sdk-platform-java@a88fdde))


### Dependencies

* update dependency com.google.auto.value:auto-value to v1.11.0
([#2842](googleapis/sdk-platform-java#2842))
([758bd17](googleapis/sdk-platform-java@758bd17))
* update dependency com.google.auto.value:auto-value-annotations to
v1.11.0
([#2843](googleapis/sdk-platform-java#2843))
([bce5720](googleapis/sdk-platform-java@bce5720))
* update dependency com.google.cloud:grpc-gcp to v1.6.1
([#2943](googleapis/sdk-platform-java#2943))
([cfc6632](googleapis/sdk-platform-java@cfc6632))
* update dependency org.checkerframework:checker-qual to v3.44.0
([#2848](googleapis/sdk-platform-java#2848))
([7069aae](googleapis/sdk-platform-java@7069aae))
* update dependency org.easymock:easymock to v5.3.0
([#2871](googleapis/sdk-platform-java#2871))
([423167f](googleapis/sdk-platform-java@423167f))
* update google api dependencies
([#2846](googleapis/sdk-platform-java#2846))
([a3d852e](googleapis/sdk-platform-java@a3d852e))
* update googleapis/java-cloud-bom digest to 17cc5ec
([#2882](googleapis/sdk-platform-java#2882))
([09e4ea6](googleapis/sdk-platform-java@09e4ea6))
* update netty dependencies to v4.1.111.final
([#2877](googleapis/sdk-platform-java#2877))
([6430ac2](googleapis/sdk-platform-java@6430ac2))
* update opentelemetry-java monorepo to v1.39.0
([#2863](googleapis/sdk-platform-java#2863))
([b0f2946](googleapis/sdk-platform-java@b0f2946))
</details>

---
This PR was generated with [Release
Please](https://github.com/googleapis/release-please). See
[documentation](https://github.com/googleapis/release-please#release-please).

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: Joe Wang <joewa@google.com>

fixes #2750
Skip parsing a service if no RPCs found for. 
In the scenario that only one service with no RPCs or all services have
no RPCs, falls back to #2460

This pr also reverts a change brought by #985, and removes the relevant
tests. For more context, this has been discussed
[here](googleapis/sdk-platform-java#2750 (comment)).

---------

Co-authored-by: Lawrence Qiu <lawrenceqiu@google.com>

…o v1-rev20240319-2.0.0 (#2460)