correcting some issues in the test

Signed-off-by: Daniel Ntege <danientege785@gmail.com>

Author: danielmarv

src/hiero_sdk_python/consensus/topic_create_transaction.py

@@ -195,7 +195,10 @@ def _to_proto_key(self, key: Key | None):
         on `_to_proto_key` continue to work after centralizing the logic in
         `hiero_sdk_python.utils.key_utils.key_to_proto`.
         """
-        return key_to_proto(key)
+        try:
+            return key_to_proto(key)
+        except TypeError as exc:
+            raise TypeError("Key must be of type PrivateKey or PublicKey") from exc
 
     def _build_proto_body(self) -> consensus_create_topic_pb2.ConsensusCreateTopicTransactionBody:
         """

src/hiero_sdk_python/tokens/token_create_transaction.py

@@ -460,7 +460,10 @@ def _to_proto_key(self, key: Key | None):
         on `_to_proto_key` continue to work after centralizing the logic in
         `hiero_sdk_python.utils.key_utils.key_to_proto`.
         """
-        return key_to_proto(key)
+        try:
+            return key_to_proto(key)
+        except TypeError as exc:
+            raise TypeError("Key must be of type PrivateKey or PublicKey") from exc
 
     def _build_proto_body(self) -> token_create_pb2.TokenCreateTransactionBody:
         """