[JENKINS-15156] PromotionProcessTest failed with parent set to 1.507 …

…because in lazy-loading versions of Jenkins the build list for a project must be explicitly created.

src/main/java/hudson/plugins/promoted_builds/JobPropertyImpl.java

@@ -132,6 +132,7 @@ public PromotionProcess addProcess(String name) throws IOException {
         activeProcessNames.add(name);
         processes.add(p);
         buildActiveProcess();
+        p.onCreatedFromScratch();
         return p;
     }