Fix RPC crashes that didn't check for an open wallet

src/wallet/wallet_rpc_server.cpp

@@ -500,6 +500,7 @@ namespace tools
   //------------------------------------------------------------------------------------------------------------------------------
   bool wallet_rpc_server::on_get_account_tags(const wallet_rpc::COMMAND_RPC_GET_ACCOUNT_TAGS::request& req, wallet_rpc::COMMAND_RPC_GET_ACCOUNT_TAGS::response& res, epee::json_rpc::error& er)
   {
+    if (!m_wallet) return not_open(er);
     const std::pair<std::map<std::string, std::string>, std::vector<std::string>> account_tags = m_wallet->get_account_tags();
     for (const std::pair<std::string, std::string>& p : account_tags.first)
     {
@@ -518,6 +519,7 @@ namespace tools
   //------------------------------------------------------------------------------------------------------------------------------
   bool wallet_rpc_server::on_tag_accounts(const wallet_rpc::COMMAND_RPC_TAG_ACCOUNTS::request& req, wallet_rpc::COMMAND_RPC_TAG_ACCOUNTS::response& res, epee::json_rpc::error& er)
   {
+    if (!m_wallet) return not_open(er);
     try
     {
       m_wallet->set_account_tag(req.accounts, req.tag);
@@ -532,6 +534,7 @@ namespace tools
   //------------------------------------------------------------------------------------------------------------------------------
   bool wallet_rpc_server::on_untag_accounts(const wallet_rpc::COMMAND_RPC_UNTAG_ACCOUNTS::request& req, wallet_rpc::COMMAND_RPC_UNTAG_ACCOUNTS::response& res, epee::json_rpc::error& er)
   {
+    if (!m_wallet) return not_open(er);
     try
     {
       m_wallet->set_account_tag(req.accounts, "");
@@ -546,6 +549,7 @@ namespace tools
   //------------------------------------------------------------------------------------------------------------------------------
   bool wallet_rpc_server::on_set_account_tag_description(const wallet_rpc::COMMAND_RPC_SET_ACCOUNT_TAG_DESCRIPTION::request& req, wallet_rpc::COMMAND_RPC_SET_ACCOUNT_TAG_DESCRIPTION::response& res, epee::json_rpc::error& er)
   {
+    if (!m_wallet) return not_open(er);
     try
     {
       m_wallet->set_account_tag_description(req.tag, req.description);
@@ -2054,6 +2058,7 @@ namespace tools
   //------------------------------------------------------------------------------------------------------------------------------
   bool wallet_rpc_server::on_make_uri(const wallet_rpc::COMMAND_RPC_MAKE_URI::request& req, wallet_rpc::COMMAND_RPC_MAKE_URI::response& res, epee::json_rpc::error& er)
   {
+    if (!m_wallet) return not_open(er);
     std::string error;
     std::string uri = m_wallet->make_uri(req.address, req.payment_id, req.amount, req.tx_description, req.recipient_name, error);
     if (uri.empty())
@@ -2267,6 +2272,7 @@ namespace tools
   //------------------------------------------------------------------------------------------------------------------------------
   bool wallet_rpc_server::on_stop_mining(const wallet_rpc::COMMAND_RPC_STOP_MINING::request& req, wallet_rpc::COMMAND_RPC_STOP_MINING::response& res, epee::json_rpc::error& er)
   {
+    if (!m_wallet) return not_open(er);
     cryptonote::COMMAND_RPC_STOP_MINING::request daemon_req;
     cryptonote::COMMAND_RPC_STOP_MINING::response daemon_res;
     bool r = m_wallet->invoke_http_json("/stop_mining", daemon_req, daemon_res);