[TAP] Ensure scalar values do not have an `arraysize="1"` attribute in VOTable.

src/tap/metadata/VotType.java

 package tap.metadata;
 
+import adql.db.DBType;
+import adql.db.DBType.DBDatatype;
+
 /*
  * This file is part of TAPLibrary.
  * 
@@ -16,14 +19,12 @@ package tap.metadata;
  * You should have received a copy of the GNU Lesser General Public License
  * along with TAPLibrary.  If not, see <http://www.gnu.org/licenses/>.
  * 
- * Copyright 2012,2014 - UDS/Centre de Données astronomiques de Strasbourg (CDS),
+ * Copyright 2012-2017 - UDS/Centre de Données astronomiques de Strasbourg (CDS),
  *                       Astronomisches Rechen Institut (ARI)
  */
 
 import tap.TAPException;
 import uk.ac.starlink.votable.VOSerializer;
-import adql.db.DBType;
-import adql.db.DBType.DBDatatype;
 
 /**
  * <p>Describes a full VOTable type. Thus it includes the following field attributes:</p>
@@ -34,7 +35,7 @@ import adql.db.DBType.DBDatatype;
  * </ul>
  * 
  * @author Gr&eacute;gory Mantelet (CDS;ARI)
- * @version 2.0 (02/2015)
+ * @version 2.1 (03/2017)
  */
 public final class VotType {
 	/**
@@ -129,43 +130,43 @@ public final class VotType {
 		switch(tapType.type){
 			case SMALLINT:
 				this.datatype = VotDatatype.SHORT;
-				this.arraysize = "1";
+				this.arraysize = null;
 				this.xtype = null;
 				break;
 
 			case INTEGER:
 				this.datatype = VotDatatype.INT;
-				this.arraysize = "1";
+				this.arraysize = null;
 				this.xtype = null;
 				break;
 
 			case BIGINT:
 				this.datatype = VotDatatype.LONG;
-				this.arraysize = "1";
+				this.arraysize = null;
 				this.xtype = null;
 				break;
 
 			case REAL:
 				this.datatype = VotDatatype.FLOAT;
-				this.arraysize = "1";
+				this.arraysize = null;
 				this.xtype = null;
 				break;
 
 			case DOUBLE:
 				this.datatype = VotDatatype.DOUBLE;
-				this.arraysize = "1";
+				this.arraysize = null;
 				this.xtype = null;
 				break;
 
 			case CHAR:
 				this.datatype = VotDatatype.CHAR;
-				this.arraysize = Integer.toString(tapType.length > 0 ? tapType.length : 1);
+				this.arraysize = Integer.toString(tapType.length > 0 ? tapType.length : null);
 				this.xtype = null;
 				break;
 
 			case BINARY:
 				this.datatype = VotDatatype.UNSIGNEDBYTE;
-				this.arraysize = Integer.toString(tapType.length > 0 ? tapType.length : 1);
+				this.arraysize = Integer.toString(tapType.length > 0 ? tapType.length : null);
 				this.xtype = null;
 				break;