[JENKINS-76190] Error retrieving tag timestamp from webhook event (#1142)

Use toHash if fromHash is valued with null hash (0000000000000000000000000000000000000000) on data center TAG event

Author: nfalco79

src/main/java/com/cloudbees/jenkins/plugins/bitbucket/impl/webhook/server/ServerPushEvent.java

@@ -103,6 +103,7 @@ public boolean equals(Object obj) {
 
     // event logs with the name of the processor
     private static final Logger LOGGER = Logger.getLogger(ServerPushWebhookProcessor.class.getName());
+    private static final String NULL_HASH = "0000000000000000000000000000000000000000";
 
     private final BitbucketServerRepository repository;
     private final BitbucketServerCommit refCommit;
@@ -160,7 +161,7 @@ private void addBranchesAndTags(BitbucketSCMSource src, Map<SCMHead, SCMRevision
                         break;
                     }
                     case "DELETE": {
-                        tagHash = change.getFromHash();
+                        tagHash = !NULL_HASH.equals(change.getFromHash()) ? change.getFromHash() : change.getToHash();
                         break;
                     }
                     default:

src/main/resources/com/cloudbees/jenkins/plugins/bitbucket/endpoints/BitbucketEndpointConfiguration/config.jelly

@@ -1,3 +1,19 @@
+<!--
+Copyright 2024 Nikolas Falco
+
+Licensed under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
 <?jelly escape-by-default='true'?>
 <j:jelly xmlns:j="jelly:core"
          xmlns:f="/lib/form">