[bulk tag] fixed Community configuration parsing to void NPE

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

@@ -90,12 +90,12 @@ public class CommunityConfigurationFactory {
 	}
 
 	private static SelectionConstraints parseConstrains(Node node) {
-		Node aconstraints = node.selectSingleNode("./advancedConstraints");
-		if (aconstraints == null) {
+		Node advConstsNode = node.selectSingleNode("./advancedConstraints");
+		if (advConstsNode == null || StringUtils.isBlank(StringUtils.trim(advConstsNode.getText()))) {
 			return null;
 		}
 		SelectionConstraints selectionConstraints = new Gson()
-			.fromJson(aconstraints.getText(), SelectionConstraints.class);
+			.fromJson(advConstsNode.getText(), SelectionConstraints.class);
 
 		selectionConstraints.setSelection(resolver);
 		return selectionConstraints;

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

@@ -83,4 +83,36 @@ class CommunityConfigurationFactoryTest {
 		Assertions.assertEquals("dariah", comm.get(0));
 	}
 
+	@Test
+	void loadSelCriteriaTest2() throws DocumentException, IOException, SAXException {
+		String xml = IOUtils
+				.toString(
+						getClass()
+								.getResourceAsStream(
+										"/eu/dnetlib/dhp/bulktag/communityconfiguration/community_configuration_selcrit2.xml"));
+		final CommunityConfiguration cc = CommunityConfigurationFactory.newInstance(xml);
+		Map<String, List<String>> param = new HashMap<>();
+		param.put("author", new ArrayList<>(Collections.singletonList("Pippo Pippi")));
+		param
+				.put(
+						"description",
+						new ArrayList<>(
+								Collections
+										.singletonList(
+												"This work has been partially supported by DARIAH-EU infrastructure")));
+		param
+				.put(
+						"contributor",
+						new ArrayList<>(
+								Collections
+										.singletonList(
+												"Author X helped to write the paper. X works for DARIAH")));
+		List<String> comm = cc
+				.getCommunityForDatasource(
+						"openaire____::1cfdb2e14977f31a98e0118283401f32", param);
+
+		//TODO add more assertions
+		Assertions.assertEquals(0, comm.size());
+	}
+
 }