fixed issue on bulktagging for the advanced constraints

dhp-workflows/dhp-enrichment/src/main/java/eu/dnetlib/dhp/bulktag/community/Community.java

@@ -26,7 +26,8 @@ public class Community implements Serializable {
 	public boolean isValid() {
 		return !getSubjects().isEmpty()
 			|| !getProviders().isEmpty()
-			|| !getZenodoCommunities().isEmpty();
+			|| !getZenodoCommunities().isEmpty()
+				|| constraints != null;
 	}
 
 	public String getId() {

dhp-workflows/dhp-enrichment/src/test/java/eu/dnetlib/dhp/bulktag/BulkTagJobTest.java

@@ -47,8 +47,8 @@ public class BulkTagJobTest {
 		+ "  \"contributor\" : \"$['contributor'][*]['value']\","
 		+ "  \"description\" : \"$['description'][*]['value']\", "
 		+ " \"subject\" :\"$['subject'][*]['value']\" , " +
-
+		"\"fos\" : \"$['subject'][?(@['qualifier']['classid']=='FOS')].value\"" +
-		"\"fos\" : \"$['subject'][?(@['qualifier']['classid']=='subject:fos')].value\"} ";
+		"} ";
 
 	private static SparkSession spark;
 
@@ -64,7 +64,7 @@ public class BulkTagJobTest {
 				.toString(
 					BulkTagJobTest.class
 						.getResourceAsStream(
-							"/eu/dnetlib/dhp/bulktag/communityconfiguration/tagging_conf.xml"));
+							"/eu/dnetlib/dhp/bulktag/communityconfiguration/tagging_conf_dth.xml"));
 		} catch (IOException e) {
 			e.printStackTrace();
 		}