db - fix dbsize nil err

db/db.go

@@ -161,7 +161,7 @@ func (db *Db) SizeDb(dbname string) float32 {
 		if !done {
 			if err == sql.ErrNoRows {
 				fmt.Printf("   cannot find db %s or db is empty\n", dbname)
-			} else {
+			} else if err != nil {
 				fmt.Printf("   what the fuck error : %+v\n", err)
 			}
 		}