new tests based on new ghost-network functinality

Signed-off-by: Uncle Stinky <uncle.stinky@ghostchain.io>

pallets/slow-clap/src/lib.rs

@@ -558,7 +558,7 @@ impl<T: Config> Pallet<T> {
         received_claps_key: &(SessionIndex, &H256, &H256),
     ) -> DispatchResult {
         ApplausesForTransaction::<T>::try_mutate(received_claps_key, |is_applaused| {
-            if *is_applaused {
+            if *is_applaused || T::NetworkDataHandler::is_nullification_period() {
                 return Ok(())
             }