v.out.ascii: olumn names are case sensitive

	     (merge from devbr6, https://trac.osgeo.org/grass/changeset/34926)


git-svn-id: https://svn.osgeo.org/grass/grass/trunk@34927 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.out.ascii/b2a.c

@@ -218,6 +218,9 @@ int bin_to_asc(FILE *ascii,
 			    case DB_C_TYPE_DATETIME: {
 				break;
 			    }
+			    case -1:
+				G_fatal_error(_("Column <%s> not found in table <%s>"),
+					      columns[i], Fi->table);
 			    default: G_fatal_error(_("Column <%s>: unsupported data type"),
 						   columns[i]);
 			    }