AdoDB Performance: RecordSet_postgres7->MoveNext() - remove expensive is_array()

And implicit count() of the array keys/columns. This shaves a good 5%
of the exec time of get_records('config')

htdocs/lib/adodb/drivers/adodb-postgres7.inc.php

@@ -185,8 +185,8 @@ class ADORecordSet_postgres7 extends ADORecordSet_postgres64{
 			if ($this->_numOfRows < 0 || $this->_numOfRows > $this->_currentRow) {
 				$this->fields = @pg_fetch_array($this->_queryID,$this->_currentRow,$this->fetchMode);
 			
-				if (is_array($this->fields)) {
-					if ($this->fields && isset($this->_blobArr)) $this->_fixblobs();
+				if ($this->fields!==FALSE) {
+					if (isset($this->_blobArr)) $this->_fixblobs();
 					return true;
 				}
 			}