fix(sync): add error log when pState is NULL

source/libs/sync/src/syncMain.c

@@ -337,6 +337,7 @@ char* syncNodePeerState2Str(const SSyncNode* pSyncNode) {
   for (int32_t i = 0; i < pSyncNode->replicaNum; ++i) {
     SPeerState* pState = syncNodeGetPeerState((SSyncNode*)pSyncNode, &(pSyncNode->replicasId[i]));
     if (pState == NULL) {
+      sError("vgId:%d, replica maybe dropped", pSyncNode->vgId);
       break;
     }
 
@@ -3497,6 +3498,7 @@ SPeerState* syncNodeGetPeerState(SSyncNode* ths, const SRaftId* pDestId) {
 bool syncNodeNeedSendAppendEntries(SSyncNode* ths, const SRaftId* pDestId, const SyncAppendEntries* pMsg) {
   SPeerState* pState = syncNodeGetPeerState(ths, pDestId);
   if (pState == NULL) {
+    sError("vgId:%d, replica maybe dropped", ths->vgId);
     return false;
   }
 

source/libs/sync/src/syncReplication.c

@@ -163,7 +163,10 @@ int32_t syncNodeSendAppendEntries(SSyncNode* pSyncNode, const SRaftId* destRaftI
   syncNodeSendMsgById(destRaftId, pSyncNode, &rpcMsg);
 
   SPeerState* pState = syncNodeGetPeerState(pSyncNode, destRaftId);
-  ASSERT(pState != NULL);
+  if (pState == NULL) {
+    sError("vgId:%d, replica maybe dropped", pSyncNode->vgId);
+    return 0;
+  }
 
   if (pMsg->dataLen > 0) {
     pState->lastSendIndex = pMsg->prevLogIndex + 1;