Fix issue with repeating {{ else }} blocks

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

tests/checks.rs

@@ -5,9 +5,13 @@ fn check_files() {
     for file in files {
         let input = std::fs::read_to_string(file.unwrap().path()).unwrap();
 
-        let parsed = nomo::parser::parse(input.into()).unwrap();
+        let Ok(parsed) = nomo::parser::parse(input.into()) else {
+            continue;
+        };
 
-        let ast = nomo::ast::parse(parsed.tokens()).unwrap();
+        let Ok(ast) = nomo::ast::parse(parsed.tokens()) else {
+            continue;
+        };
 
         let _emit = nomo::emit::emit_machine(ast);
     }

tests/checks/minimized-from-288cd3d11ffabe7f439c235924d88509deb93bc4

@@ -0,0 +1,3 @@
+{{ if t }}
+{{else}}{{ else }}
+{{end }}