test(no_empty_block): add test case for nested if else with comment

Author: Andrew-Bekhiet

lint_test/no_empty_block_test.dart

@@ -69,3 +69,14 @@ void anotherExample() {
     // explain why this block is empty
   });
 }
+
+void nestedIfElse() {
+  if (true) {
+    if (true) {
+      // no lint
+      if (true) {
+        // explain why this block is empty
+      }
+    }
+  }
+}