Check prevDescription not null to avoid NPE #38
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We encounter an error when the source MR has an empty description. I added a check for null.
Message from log:
{"message":"GitlabEvent: '38e2b796-c896-430b-b853-edf3fefebdce' | Exception while creating auto merge request. Project: '288', User: '20', SourceBranch: 'feature-PR-7569', TargetBranch: 'release-24.4', MergeRequestNumber: '17', MergeSha: 'fed6e09508eba69a19793cdd7e69dbaf39d07e20'\njava.lang.NullPointerException: Cannot invoke "String.isBlank()" because "prevDescription" is null\n\tat service.GitLabService.buildDescription(GitLabService.java:321)\n\tat service.GitLabService.createAutoMergeRequest(GitLabService.java:276)\n\tat service.GitLabService.merge(GitLabService.java:249)\n\tat service.GitLabService.createAutoMr(GitLabService.java:219)\n\tat service.GitLabService.handleMrMergeEvent(GitLabService.java:137)\n\tat service.GitLabService.mergeRequest(GitLabService.java:96)\n\tat service.GitLabService_ClientProxy.mergeRequest(Unknown Source)\n\tat service.GitLabService_VertxInvoker_mergeRequest_a4d1c2c568052411df78f735c61ae86d3766853c.invokeBean(Unknown Source)\n\tat io.quarkus.vertx.runtime.EventConsumerInvoker.invoke(EventConsumerInvoker.java:41)\n\tat io.quarkus.vertx.runtime.VertxRecorder$3$1$1.handle(VertxRecorder.java:116)\n\tat io.quarkus.vertx.runtime.VertxRecorder$3$1$1.handle(VertxRecorder.java:112)\n\tat io.vertx.core.impl.ContextBase.lambda$null$0(ContextBase.java:137)\n\tat io.vertx.core.impl.ContextInternal.dispatch(ContextInternal.java:264)\n\tat io.vertx.core.impl.ContextBase.lambda$executeBlocking$1(ContextBase.java:135)\n\tat io.quarkus.vertx.core.runtime.VertxCoreRecorder$14.runWith(VertxCoreRecorder.java:576)\n\tat org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2449)\n\tat org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1478)\n\tat org.jboss.threads.DelegatingRunnable.run(DelegatingRunnable.java:29)\n\tat org.jboss.threads.ThreadLocalResettingRunnable.run(ThreadLocalResettingRunnable.java:29)\n\tat io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)\n\tat java.base/java.lang.Thread.run(Thread.java:833)\n","severity":"WARNING","timestamp":{"seconds":1733930365,"nanos":495059535},"logging.googleapis.com/sourceLocation":{"file":"GitLabService.java","line":"139","function":"service.GitLabService.handleMrMergeEvent"}}