Fix incorrect usages of TypeDBClientException (#231)

## What is the goal of this PR?

We fixed incorrect usages of TypeDBClientException leading to unhelpful error messages in some scenarios.

## What are the changes implemented in this PR?

Fix incorrect usages of TypeDBClientException leading to unhelpful error messages in some scenarios.

Author: alexjpwalker

typedb/api/connection/credential.py

@@ -23,14 +23,15 @@
 
 from typedb.common.exception import TypeDBClientException, CLUSTER_INVALID_ROOT_CA_PATH
 
+
 class TypeDBCredential:
 
     def __init__(self, username: str, password: str, tls_root_ca_path: str = None):
         self._username = username
         self._password = password
 
         if (tls_root_ca_path is not None and not path.exists(tls_root_ca_path)):
-            raise TypeDBClientException(CLUSTER_INVALID_ROOT_CA_PATH.message(tls_root_ca_path))
+            raise TypeDBClientException.of(CLUSTER_INVALID_ROOT_CA_PATH, tls_root_ca_path)
 
         self._tls_root_ca_path = tls_root_ca_path
 

typedb/common/exception.py

@@ -25,7 +25,7 @@
 
 class TypeDBClientException(Exception):
 
-    def __init__(self, msg: Union["ErrorMessage", str], cause: Optional[BaseException], params: Any = None):
+    def __init__(self, msg: Union["ErrorMessage", str], cause: BaseException = None, params: Any = None):
         if isinstance(msg, str):
             self.message = msg
             self.error_message = None

typedb/connection/cluster/user_manager.py

@@ -68,7 +68,7 @@ def get(self, name: str) -> User:
         if (self.contains(name)):
             return _ClusterUser(self._client, name)
         else:
-            raise TypeDBClientException(CLUSTER_USER_DOES_NOT_EXIST.message(name))
+            raise TypeDBClientException.of(CLUSTER_USER_DOES_NOT_EXIST, name)
 
 
 class _UserManagerFailsafeTask(_FailsafeTask):