[misc] ensure not throwing error when not having read all DatabaseMetadata resultset

Author: diego Dupin

src/main/java/org/mariadb/jdbc/client/result/Result.java

@@ -83,6 +83,7 @@ public Result(ColumnDefinitionPacket[] metadataList, byte[][] data, Context cont
  this.metadataList = metadataList;
  this.maxIndex = this.metadataList.length;
  this.reader = null;
+ this.loaded = true;
  this.exceptionFactory = context.getExceptionFactory();
  this.context = context;
  this.data = data;