Missing alpha node removal when the only rule using it is removed

    @Test
    public void testRemoveHasSameConElement() {
        String packageName = "test";
        String rule1 = "package " + packageName + ";" +
                       "import java.util.Map; \n" +
                       "rule 'rule1' \n" +
                       "when \n" +
                       " Map(this['type'] == 'Goods' && this['brand'] == 'a') \n" +
                       " Map(this['type'] == 'Goods' && this['category'] == 'b') \n" +
                       "then \n" +
                       "System.out.println('test rule 1'); \n"+
                       "end";

        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();

        kbuilder.add( ResourceFactory.newByteArrayResource( rule1.getBytes() ), ResourceType.DRL );
        if ( kbuilder.hasErrors() ) {
            fail( kbuilder.getErrors().toString() );
        }
        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
        kbase.removeKnowledgePackage(packageName);
        StatelessKnowledgeSession session = kbase.newStatelessKnowledgeSession();
        session.execute(new HashMap());
    }