fix(java): skip fixing poms for special modules (#1744)

fix(java): handle empty modules

Fixes googleapis/synthtool#1743
Source-Link: googleapis/synthtool@482d649
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-java:latest@sha256:bd5071596a47614d1fe15eb766c4255bae330f823b606e1196a3b0c8d2e96fd1

.github/.OwlBot.lock.yaml

@@ -1,4 +1,4 @@
-# Copyright 2022 Google LLC
+# Copyright 2023 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -13,4 +13,4 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-java:latest
-  digest: sha256:edae91ccdd2dded2f572ec341a768ad180305a3e8fbfd93064b28e237d35920a
+  digest: sha256:bd5071596a47614d1fe15eb766c4255bae330f823b606e1196a3b0c8d2e96fd1

.kokoro/presubmit/graalvm-native-17.cfg

@@ -3,7 +3,7 @@
 # Configure the docker image for kokoro-trampoline.
 env_vars: {
   key: "TRAMPOLINE_IMAGE"
-  value: "gcr.io/cloud-devrel-kokoro-resources/graalvm17"
+  value: "gcr.io/cloud-devrel-kokoro-resources/graalvm17:22.3.0"
 }
 
 env_vars: {

.kokoro/presubmit/graalvm-native.cfg

@@ -3,7 +3,7 @@
 # Configure the docker image for kokoro-trampoline.
 env_vars: {
   key: "TRAMPOLINE_IMAGE"
-  value: "gcr.io/cloud-devrel-kokoro-resources/graalvm"
+  value: "gcr.io/cloud-devrel-kokoro-resources/graalvm:22.3.0"
 }
 
 env_vars: {

.kokoro/requirements.in

@@ -1,33 +1,6 @@
-gcp-docuploader==0.6.3
-google-crc32c==1.3.0
-googleapis-common-protos==1.56.3
-gcp-releasetool==1.8.7
-cachetools==4.2.4
-cffi==1.15.1
-jeepney==0.7.1
-jinja2==3.0.3
-markupsafe==2.0.1
-keyring==23.4.1
-packaging==21.3
-protobuf==3.19.5
-pyjwt==2.4.0
-pyparsing==3.0.9
-pycparser==2.21
-pyperclip==1.8.2
-python-dateutil==2.8.2
-requests==2.27.1
-certifi==2022.9.24
-importlib-metadata==4.8.3
-zipp==3.6.0
-google_api_core==2.8.2
-google-cloud-storage==2.0.0
-google-resumable-media==2.3.3
-google-cloud-core==2.3.1
-typing-extensions==4.1.1
-urllib3==1.26.12
-zipp==3.6.0
-rsa==4.9
-six==1.16.0
-attrs==22.1.0
-google-auth==2.11.0
-idna==3.4
+gcp-docuploader
+gcp-releasetool
+wheel
+setuptools
+typing-extensions
+click<8.1.0