1. Bug fix on repository convert

2. Update pom with postgres dependency

pom.xml

@@ -223,6 +223,13 @@
             <artifactId>typescript-generator-maven-plugin</artifactId>
             <version>1.29.366</version>
         </dependency>
+        <!-- https://mvnrepository.com/artifact/postgresql/postgresql -->
+        <dependency>
+            <groupId>postgresql</groupId>
+            <artifactId>postgresql</artifactId>
+            <version>9.1-901.jdbc3</version>
+        </dependency>
+
 
 
     </dependencies>

src/main/java/eu/dnetlib/repo/manager/service/utils/Converter.java

@@ -82,7 +82,7 @@ public class Converter {
         repository.setQualityManagementKind(datasource.get("qualitymanagementkind").toString());
         repository.setRegisteredBy(datasource.get("registeredby").toString());
 
-        if(repository.getRegisteredBy() != null)
+        if(Objects.equals(repository.getRegisteredBy(),"null"))
             repository.setRegistered(true);
 
         repository.setReleaseEndDate(convertStringToDate(datasource.get("releaseenddate").toString()));