fix: issue creating transaction not connected to a provider (#2685)

Author: antazoey

src/ape/api/transactions.py

@@ -75,10 +75,11 @@ def __init__(self, *args, **kwargs):
     @classmethod
     def validate_gas_limit(cls, value):
         if value is None:
-            if not cls.network_manager.connected:
-                raise NetworkError("Must be connected to use default gas config.")
-
-            value = cls.network_manager.active_provider.network.gas_limit
+            value = (
+                cls.network_manager.active_provider.network.gas_limit
+                if cls.network_manager.connected
+                else 0
+            )
 
         if value == "auto" or isinstance(value, AutoGasLimit):
             return None  # Delegate to `ProviderAPI.estimate_gas_cost`

tests/functional/test_ecosystem.py

@@ -846,6 +846,12 @@ def test_create_transaction_uses_network_gas_limit(tx_type, ethereum, eth_tester
     assert tx.gas_limit == eth_tester_provider.max_gas
 
 
+def test_create_transaction_not_connected(networks_disconnected):
+    tx = networks_disconnected.ethereum.create_transaction()
+    # Show it doesn't try to refer to network gas limit.
+    assert tx.gas_limit == 0
+
+
 def test_create_transaction_with_none_values(ethereum, eth_tester_provider):
     """
     Tests against None being in place of values in kwargs,