native: ignore decoding errors during cache init

Bad contract -> no contract. Unfortunately we've got a broken
6f1837723768f27a6f6a14452977e3e0e264f2cc contract on the mainnet which can't
be decoded (even though it had been saved successfully), so this is a
temporary fix for #2801 to be able to start mainnet node after shutdown.

pkg/core/blockchain_neotest_test.go

@@ -207,6 +207,7 @@ func TestBlockchain_StartFromExistingDB(t *testing.T) {
 		require.Error(t, err)
 		require.True(t, strings.Contains(err.Error(), "can't init MPT at height"), err)
 	})
+	/* See #2801
 	t.Run("failed native Management initialisation", func(t *testing.T) {
 		ps = newPS(t)
 
@@ -223,6 +224,7 @@ func TestBlockchain_StartFromExistingDB(t *testing.T) {
 		require.Error(t, err)
 		require.True(t, strings.Contains(err.Error(), "can't init cache for Management native contract"), err)
 	})
+	*/
 	t.Run("invalid native contract deactivation", func(t *testing.T) {
 		ps = newPS(t)
 		_, _, _, err := chain.NewMultiWithCustomConfigAndStoreNoCheck(t, func(c *config.ProtocolConfiguration) {

pkg/core/native/management.go

@@ -539,19 +539,13 @@ func (m *Management) InitializeCache(d *dao.Simple) error {
 		nep17:     make(map[util.Uint160]struct{}),
 	}
 
-	var initErr error
-	d.Seek(m.ID, storage.SeekRange{Prefix: []byte{PrefixContract}}, func(_, v []byte) bool {
+	d.Seek(m.ID, storage.SeekRange{Prefix: []byte{PrefixContract}}, func(k, v []byte) bool {
 		var cs = new(state.Contract)
-		initErr = stackitem.DeserializeConvertible(v, cs)
-		if initErr != nil {
-			return false
-		}
+		if stackitem.DeserializeConvertible(v, cs) == nil {
 			updateContractCache(cache, cs)
+		}
 		return true
 	})
-	if initErr != nil {
-		return initErr
-	}
 	d.SetCache(m.ID, cache)
 	return nil
 }

pkg/core/native/management_test.go

@@ -78,12 +78,14 @@ func TestManagement_Initialize(t *testing.T) {
 		mgmt := newManagement()
 		require.NoError(t, mgmt.InitializeCache(d))
 	})
+	/* See #2801
 	t.Run("invalid contract state", func(t *testing.T) {
 		d := dao.NewSimple(storage.NewMemoryStore(), false, false)
 		mgmt := newManagement()
 		d.PutStorageItem(mgmt.ID, []byte{PrefixContract}, state.StorageItem{0xFF})
 		require.Error(t, mgmt.InitializeCache(d))
 	})
+	*/
 }
 
 func TestManagement_GetNEP17Contracts(t *testing.T) {