Update src/generation/generate.rs

Author: dsherret

src/generation/generate.rs

@@ -3065,7 +3065,7 @@ fn maybe_gen_tagged_tpl_with_external_formatter<'a>(node: &TaggedTpl<'a>, contex
   for line in formatted_tpl.lines() {
     // count indent characters
     let mut pos = line.chars().take_while(|ch| *ch == indent_char).count();
-    let indent_level = pos / indent_width as usize;
+    let indent_level = if index_width == 0 { 0 } else { pos / indent_width as usize };
     if indent_level > current_indent_level {
       items.push_signal(Signal::StartIndent);
       current_indent_level = indent_level;