Fix the position of '@none' while sorting datasetIds

Small improvement to the sorting of datasetIds, which ensures that
the datasetId '@none' will always be the first index, even when
unsanitized URIs are inputted.

Signed-off-by: Meric Feyzullahoglu <meric.feyzullahoglu@gmail.com>

KafkaBridge/lib/debeziumBridge.js

@@ -190,7 +190,11 @@ module.exports = function DebeziumBridge (conf) {
             counter++;
           }
         });
-        copyArr.sort((a, b) => a[['https://uri.etsi.org/ngsi-ld/datasetId']].localeCompare(b['https://uri.etsi.org/ngsi-ld/datasetId']));
+        copyArr.sort((a, b) => {
+          if (a['https://uri.etsi.org/ngsi-ld/datasetId'] === '@none' ) return -1;
+          if (b['https://uri.etsi.org/ngsi-ld/datasetId'] === '@none' ) return 1;
+          return a['https://uri.etsi.org/ngsi-ld/datasetId'].localeCompare(b['https://uri.etsi.org/ngsi-ld/datasetId']);
+        });
         copyArr.forEach((obj, idx) => { // Index it according to their sorting
           obj.index = idx;
         });