fix: Change None check to Falsey check for ContractLogicError message to be the TB revert type

src/ape/exceptions.py

@@ -305,7 +305,6 @@ def __init__(
     ):
         self.txn = txn
         self.contract_address = contract_address
-
         super().__init__(
             base_err=base_err,
             contract_address=contract_address,
@@ -316,8 +315,7 @@ def __init__(
             trace=trace,
             txn=txn,
         )
-
-        if revert_message is None and source_traceback is not None and (dev := self.dev_message):
+        if not revert_message and source_traceback is not None and (dev := self.dev_message):
             try:
                 # Attempt to use dev message as main exception message.
                 self.message = dev

tests/functional/test_exceptions.py

@@ -1,5 +1,6 @@
 import re
 from pathlib import Path
+from typing import Optional
 
 import pytest
 
@@ -11,6 +12,7 @@
     TransactionError,
     handle_ape_exception,
 )
+from ape.types import SourceTraceback
 from ape_ethereum.transactions import DynamicFeeTransaction, Receipt
 
 
@@ -207,3 +209,18 @@ def test_handle_ape_exception_hides_home_dir(mocker):
     # We expect the same only the home dir has been hidden.
     expected = "\n" + tb_str.replace(str(Path.home()), "$HOME")
     assert actual == expected
+
+
+class TestContractLogicError:
+    @pytest.mark.parametrize("revert_message", (None, ""))
+    def test_message_uses_revert_type_when_no_revert_message(self, mocker, revert_message):
+        class TB(SourceTraceback):
+            @property
+            def revert_type(self) -> Optional[str]:
+                return "CUSTOM_ERROR"
+
+        tb = TB([{"statements": [], "closure": {"name": "fn"}, "depth": 0}])  # type: ignore
+        error = ContractLogicError(revert_message=revert_message, source_traceback=tb)
+        actual = error.message
+        expected = "CUSTOM_ERROR"
+        assert actual == expected