Initializing t.data with new content instead of leaving it as nil

[zveinn]

leaving t.data as nil causes a panic if the table is re-rendered again without adding new rows

[aymanbagabas]

@zveinn Could you please add a test case?

[zveinn]

Not really, I´m too busy to write that for you :S sorry @aymanbagabas

[siennathesane]

Here's the test code to be added...

func TestEmptyTable(t *testing.T) {
	table := New().
		StyleFunc(TableStyle).
		Headers("Fruit", "Color", "Code")

	expected := strings.TrimSpace(`
┌───────┬───────┬──────┐
│ Fruit │ Color │ Code │
├───────┼───────┼──────┤
└───────┴───────┴──────┘
`)

	if stripString(table.String()) != expected {
		t.Fatalf("expected:\n\n%s\n\ngot:\n\n%s", expected, stripString(table.String()))
	}
}