Fixed a possible NPE in computing dependency changes.

java.lang.NullPointerException
	at hudson.model.AbstractBuild$DependencyChange.<init>(AbstractBuild.java:1036)
	at hudson.model.AbstractBuild.getDependencyChanges(AbstractBuild.java:1002)
	at hudson.model.AbstractBuild.getCulprits(AbstractBuild.java:280)
	at hudson.model.AbstractBuild.getCulprits(AbstractBuild.java:271)
	at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:538)
	at hudson.model.Run.run(Run.java:1303)
	at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:293)
	at hudson.model.ResourceController.execute(ResourceController.java:88)
	at hudson.model.Executor.run(Executor.java:137)

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@35368 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/tasks/Fingerprinter.java

@@ -359,7 +359,8 @@ public class Fingerprinter extends Recorder implements Serializable {
                 if(bp==null)    continue;       // outside Hudson
                 if(bp.is(build))    continue;   // we are the owner
                 AbstractProject job = bp.getJob();
-                if(job!=null && job.getParent()==build.getParent())
+                if (job==null)  continue;   // no longer exists
+                if (job.getParent()==build.getParent())
                     continue;   // we are the parent of the build owner, that is almost like we are the owner 
 
                 Integer existing = r.get(job);