cryptonote_format_utils: do not early out on invalid tx pubkeys

Another such pubkey might be valid

src/cryptonote_basic/cryptonote_format_utils.cpp

@@ -201,15 +201,25 @@ namespace cryptonote
   {
     crypto::key_derivation recv_derivation = AUTO_VAL_INIT(recv_derivation);
     bool r = hwdev.generate_key_derivation(tx_public_key, ack.m_view_secret_key, recv_derivation);
-    CHECK_AND_ASSERT_MES(r, false, "key image helper: failed to generate_key_derivation(" << tx_public_key << ", " << ack.m_view_secret_key << ")");
+    if (!r)
+    {
+      MWARNING("key image helper: failed to generate_key_derivation(" << tx_public_key << ", " << ack.m_view_secret_key << ")");
+      memcpy(&recv_derivation, rct::identity().bytes, sizeof(recv_derivation));
+    }
 
     std::vector<crypto::key_derivation> additional_recv_derivations;
     for (size_t i = 0; i < additional_tx_public_keys.size(); ++i)
     {
       crypto::key_derivation additional_recv_derivation = AUTO_VAL_INIT(additional_recv_derivation);
       r = hwdev.generate_key_derivation(additional_tx_public_keys[i], ack.m_view_secret_key, additional_recv_derivation);
-      CHECK_AND_ASSERT_MES(r, false, "key image helper: failed to generate_key_derivation(" << additional_tx_public_keys[i] << ", " << ack.m_view_secret_key << ")");
-      additional_recv_derivations.push_back(additional_recv_derivation);
+      if (!r)
+      {
+        MWARNING("key image helper: failed to generate_key_derivation(" << additional_tx_public_keys[i] << ", " << ack.m_view_secret_key << ")");
+      }
+      else
+      {
+        additional_recv_derivations.push_back(additional_recv_derivation);
+      }
     }
 
     boost::optional<subaddress_receive_info> subaddr_recv_info = is_out_to_acc_precomp(subaddresses, out_key, recv_derivation, additional_recv_derivations, real_output_index,hwdev);