Added early returns to avoid exceptions

ad-connector/src/main/java/net/jami/jams/ad/connector/service/UserProfileService.java

@@ -42,6 +42,7 @@ public class UserProfileService {
             }
             List<List<Field>> results = queryResponse.getAll().stream().map(EntityResponse::getValue).collect(Collectors.toList());
             if(results.size() > 0) profiles = new UserProfile[results.size()];
+            else return null;
             for(int i=0;i< profiles.length; i++){
                 profiles[i] = profileFromResponse(results.get(i));
             }

ldap-connector/src/main/java/net/jami/jams/ldap/connector/service/UserProfileService.java

@@ -31,6 +31,7 @@ public class UserProfileService {
                 SearchOperation search = new SearchOperation(connectionFactory);
                 SearchResponse res = search.execute(buildRequest(queryString,field));
                 if (res.getEntries().size() > 0) profiles = new UserProfile[res.getEntries().size()];
+                else return null;
                 Iterator<LdapEntry> iterator = res.getEntries().iterator();
                 int i = 0;
                 while(iterator.hasNext()){