add support for CDSE catalog style error message

#34

src/main/scala/org/openeo/opensearch/OpenSearchClient.scala

@@ -151,7 +151,7 @@ abstract class OpenSearchClient {
       if(response.contentType.contains("application/json") || response.contentType.contains("application/geo+json;charset=UTF-8")) {
         io.circe.parser.parse(response.body) match {
           case Left(failure) => throw new IOException(s"Exception while evaluating catalog request $url: ${response.body}")
-          case Right(json) => throw new IOException(s"Exception while evaluating catalog request $url: ${json.findAllByKey("exceptionText").mkString(";")} ")
+          case Right(json) => throw new IOException(s"Exception while evaluating catalog request $url: ${json.findAllByKey("exceptionText").mkString(";")}${json.findAllByKey("ErrorMessage").mkString(";")} ")
         }
 
         throw new IOException(s"$url returned an empty body")