[CLIENT-3106] Refactor aerospike.exception initialization code and ch…

…eck if error indicator is set after calling a C-API method (#661)

- Doc: fix base class for QueryAbortError, ClusterError, AdminError, and QueryError
- Add regression tests for Aerospike exception classes
- Renamed test_error_code.py to test_exceptions.py

doc/exception.rst

@@ -298,6 +298,14 @@ Server Errors
 
     Subclass of :py:exc:`~aerospike.exception.ServerError`.
 
+.. py:exception:: QueryAbortedError
+
+    Query was aborted.
+
+    Error code: ``210``
+
+    Subclass of :py:exc:`~aerospike.exception.ServerError`.
+
 Record Errors
 -------------
 
@@ -397,14 +405,6 @@ Record Errors
 
     Subclass of :py:exc:`~aerospike.exception.RecordError`.
 
-.. py:exception:: QueryAbortedError
-
-    Query was aborted.
-
-    Error code: ``210``
-
-    Subclass of :py:exc:`~aerospike.exception.ClientError`.
-
 Index Errors
 ------------
 
@@ -487,7 +487,7 @@ Query Errors
 
     Error code: ``213``
 
-    Subclass of :py:exc:`~aerospike.exception.AerospikeError`.
+    Subclass of :py:exc:`~aerospike.exception.ServerError`.
 
 Cluster Errors
 --------------
@@ -507,7 +507,7 @@ Cluster Errors
 
     Error code: ``11``
 
-    Subclass of :py:exc:`~aerospike.exception.AerospikeError`.
+    Subclass of :py:exc:`~aerospike.exception.ServerError`.
 
 Admin Errors
 ------------
@@ -516,6 +516,8 @@ Admin Errors
 
     The parent class for exceptions of the security API.
 
+    Subclass of :py:exc:`~aerospike.exception.ServerError`.
+
 .. py:exception:: SecurityNotSupported
 
     Security functionality not supported by connected server.

src/main/aerospike.c

@@ -160,6 +160,10 @@ PyMODINIT_FUNC PyInit_aerospike(void)
     py_global_hosts = PyDict_New();
 
     PyObject *exception = AerospikeException_New();
+    if (exception == NULL) {
+        return NULL;
+    }
+
     Py_INCREF(exception);
     int retval = PyModule_AddObject(aerospike, "exception", exception);
     if (retval == -1) {