Handle no signature/entry function id in coin and fungible processor (#…

…422)

## Testing 
Run coin and fungible asset processor

![Screenshot 2024-06-24 at 6 37 44 PM](https://github.com/aptos-labs/aptos-indexer-processors/assets/8248583/ba6c92f0-6a4b-4248-94bd-24322dd6600f)
![Screenshot 2024-06-24 at 6 36 28 PM](https://github.com/aptos-labs/aptos-indexer-processors/assets/8248583/1518dcd9-d0b0-4b5b-9f06-baedf00cb972)

rust/processor/src/db/common/models/coin_models/coin_activities.rs

@@ -273,18 +273,10 @@ impl CoinActivity {
     ) -> Self {
         let aptos_coin_burned =
             BigDecimal::from(txn_info.gas_used * user_transaction_request.gas_unit_price);
-        let signature = user_transaction_request
-            .signature
-            .as_ref()
-            .unwrap_or_else(|| {
-                tracing::error!(
-                    transaction_version = transaction_version,
-                    "User transaction must have signature"
-                );
-                panic!("User transaction must have signature")
-            });
-        let gas_fee_payer_address =
-            Signature::get_fee_payer_address(signature, transaction_version);
+        let gas_fee_payer_address = match user_transaction_request.signature.as_ref() {
+            Some(signature) => Signature::get_fee_payer_address(signature, transaction_version),
+            None => None,
+        };
 
         Self {
             transaction_version,