rpc: allow getblocktemplate for test chains when unconnected or in IBD

src/rpc/mining.cpp

@@ -670,11 +670,13 @@ static RPCHelpMan getblocktemplate()
     if(!node.connman)
         throw JSONRPCError(RPC_CLIENT_P2P_DISABLED, "Error: Peer-to-peer functionality missing or disabled");
 
+    if (!Params().IsTestChain()) {
         if (node.connman->GetNodeCount(CConnman::CONNECTIONS_ALL) == 0)
         throw JSONRPCError(RPC_CLIENT_NOT_CONNECTED, PACKAGE_NAME " is not connected!");
 
         if (::ChainstateActive().IsInitialBlockDownload())
             throw JSONRPCError(RPC_CLIENT_IN_INITIAL_DOWNLOAD, PACKAGE_NAME " is in initial sync and waiting for blocks...");
+    }
 
     static unsigned int nTransactionsUpdatedLast;
     const CTxMemPool& mempool = EnsureMemPool(request.context);