Add a noop if no whitespace is emitted to have something to jump to

Signed-off-by: Marcel Müller <neikos@neikos.email>

src/emit/mod.rs

@@ -45,6 +45,7 @@ pub enum Instruction {
     Jump {
         jump: isize,
     },
+    NoOp,
 }
 
 pub fn emit_machine(input: crate::ast::TemplateAst<'_>) -> Vec<Instruction> {
@@ -185,6 +186,8 @@ fn emit_ast_expr(
                 eval.push(Instruction::AppendContent {
                     content: ws.source().clone(),
                 });
+            } else {
+                eval.push(Instruction::NoOp);
             }
 
             for index in end_indices {