Don't write empty TJs

Author: camelpunch

lib/mudbrick/text_block/output.ex

@@ -124,7 +124,6 @@ defmodule Mudbrick.TextBlock.Output do
 
   defp reduce_parts(output, %Line{parts: []}, nil, _x_offset) do
     output
-    |> add(%TJ{kerned_text: []})
     |> add(%TStar{})
   end
 

test/mudbrick/text_block_test.exs

@@ -249,11 +249,9 @@ defmodule Mudbrick.TextBlockTest do
                "0 0 0 rg",
                "[ <014C> <010F> 12 <0116> <011D> <01B7> <00ED> <00D9> <00F4> 8 <00C0> ] TJ",
                "T*",
-               "",
                "T*",
                "[ <0116> 24 <00C0> <00B5> <00FC> <00F4> <00BB> <01B7> <00ED> <00D9> <00F4> 8 <00C0> ] TJ",
                "T*",
-               "",
                "ET"
              ] =
                output(fn %{fonts: fonts} ->
@@ -419,7 +417,6 @@ defmodule Mudbrick.TextBlockTest do
                "83.38000000000001 0 Td",
                "-0.0 0 Td",
                "T*",
-               "",
                "0.0 0 Td",
                "-9.26 0 Td",
                "T*",