ConvertSwitchToIfIntention: preserve comments from expression when only default branch is present

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/switchDefault/beforeBreakLast.java

@@ -1,7 +1,7 @@
 // "Unwrap 'switch'" "true"
 class X {
   String test(char c) {
-    s<caret>witch (c) {
+    s<caret>witch (c/*comment*/) {
       default:
         if(c == 'a') {
           System.out.println("foo");