Auto merge of #13409 - lukaslueg:issue13407, r=dswij

Fix `if_then_some_else_none` sugg missing closure intro

Fixes #13407

#13407 works in current stable. The suggestion-generating code got trampled over in 0532104247 :-)

changelog: [`if_then_some_else_none`]: Fix missing closure in suggestion

clippy_lints/src/if_then_some_else_none.rs

@@ -105,6 +105,8 @@ impl<'tcx> LateLintPass<'tcx> for IfThenSomeElseNone {
                             snippet_with_context(cx, first_stmt.span.until(then_arg.span), ctxt, "..", &mut app);
                         let closure = if method_name == "then" { "|| " } else { "" };
                         format!("{closure} {{ {block_snippet}; {arg_snip} }}")
+                    } else if method_name == "then" {
+                        (std::borrow::Cow::Borrowed("|| ") + arg_snip).into_owned()
                     } else {
                         arg_snip.into_owned()
                     };