using object_attributes.oldrev for alwaysIgnoreNonCodeRelatedUpdates (#335)

Author: mifitous

src/main/java/io/jenkins/plugins/gitlabbranchsource/GitLabMergeRequestTrigger.java

@@ -43,27 +43,7 @@ private boolean shouldBuild(MergeRequestEvent mrEvent, GitLabSCMSourceContext co
 
         if (action != null) {
             if (action.equals("update") && context.alwaysIgnoreNonCodeRelatedUpdates()) {
-                if (mrEvent.getChanges().getAssignees() != null) {
-                    shouldBuild = false;
-                }
-
-                if (mrEvent.getChanges().getDescription() != null) {
-                    shouldBuild = false;
-                }
-
-                if (mrEvent.getChanges().getMilestoneId() != null) {
-                    shouldBuild = false;
-                }
-
-                if (mrEvent.getChanges().getTitle() != null) {
-                    shouldBuild = false;
-                }
-
-                if (mrEvent.getChanges().getTotalTimeSpent() != null) {
-                    shouldBuild = false;
-                }
-
-                if (mrEvent.getChanges().getLabels() != null) {
+                if (attributes.getOldrev() == null) {
                     shouldBuild = false;
                 }
             }