Convert assert in create into a warning

Turn the assert statement in create into a warning, this restores the
ability to import tokens through Metamask.

Details: When importing tokens, Metamask sends a create call without
sender information, triggering an assert failure.

Signed-off-by: Michael Maurer <maurer.mi@northeastern.edu>

src/parsec/agent/runners/evm/host.cpp

@@ -225,7 +225,15 @@ namespace cbdc::parsec::agent::runner {
 
     auto evm_host::create(const evmc_message& msg) noexcept -> evmc::Result {
         auto maybe_sender_acc = get_account(msg.sender, false);
-        assert(maybe_sender_acc.has_value());
+        if(!maybe_sender_acc.has_value()) {
+            m_log->warn("EVM CREATE: sender account not found");
+            return evmc::Result(
+                evmc::make_result(evmc_status_code::EVMC_REVERT,
+                                  0,
+                                  0,
+                                  nullptr,
+                                  0));
+        }
         auto& sender_acc = maybe_sender_acc.value();
 
         auto new_addr = evmc::address();