ATLAS-3965: Relationships with null values are missing in entity relationshipAttributes

repository/src/main/java/org/apache/atlas/repository/store/graph/v2/EntityGraphRetriever.java

@@ -1352,13 +1352,12 @@ public class EntityGraphRetriever {
                 break;
         }
 
-        if (ret != null) {
+        // Set Relationship attributes, even if the value is null
         entity.setRelationshipAttribute(attributeName, ret);
 
         if (attributeEndDef.getIsLegacyAttribute() && !entity.hasAttribute(attributeName)) {
             entity.setAttribute(attributeName, toLegacyAttribute(ret));
         }
-        }
 
         return ret;
     }