fix no rows return error when close (#1334)

Author: lunny

rows.go

@@ -113,17 +113,9 @@ func (rows *Rows) Close() error {
 		defer rows.session.Close()
 	}
 
-	if rows.lastError == nil {
-		if rows.rows != nil {
-			rows.lastError = rows.rows.Close()
-			if rows.lastError != nil {
-				return rows.lastError
-			}
-		}
-	} else {
-		if rows.rows != nil {
-			defer rows.rows.Close()
-		}
+	if rows.rows != nil {
+		return rows.rows.Close()
 	}
+
 	return rows.lastError
 }

rows_test.go

@@ -38,6 +38,22 @@ func TestRows(t *testing.T) {
 		cnt++
 	}
 	assert.EqualValues(t, 1, cnt)
+	assert.False(t, rows.Next())
+	assert.NoError(t, rows.Close())
+
+	rows0, err := testEngine.Where("1>1").Rows(new(UserRows))
+	assert.NoError(t, err)
+	defer rows0.Close()
+
+	cnt = 0
+	user0 := new(UserRows)
+	for rows0.Next() {
+		err = rows0.Scan(user0)
+		assert.NoError(t, err)
+		cnt++
+	}
+	assert.EqualValues(t, 0, cnt)
+	assert.NoError(t, rows0.Close())
 
 	sess := testEngine.NewSession()
 	defer sess.Close()