Use ElementStyle as a value instead of pointer, so we can drop all the annoying nil checks

table.go

@@ -26,14 +26,13 @@ func (e *TableElement) Render(w io.Writer, node *bf.Node, tr *TermRenderer) erro
 	var indent uint
 	var margin uint
 	rules := tr.style[Table]
-	if rules != nil {
-		if rules.Indent != nil {
-			indent = *rules.Indent
-		}
-		if rules.Margin != nil {
-			margin = *rules.Margin
-		}
+	if rules.Indent != nil {
+		indent = *rules.Indent
 	}
+	if rules.Margin != nil {
+		margin = *rules.Margin
+	}
+
 	iw := &IndentWriter{
 		Indent: indent + margin,
 		IndentFunc: func(wr io.Writer) {