sq: impl: check if session is used

Author: kevinAlbs

src/libmongoc/src/mongoc/mongoc-bulkwrite.c

@@ -1616,8 +1616,9 @@ mongoc_bulkwrite_execute (mongoc_bulkwrite_t *self, const mongoc_bulkwriteopts_t
                   BSON_ASSERT (bson_in_range_int32_t_unsigned (serverid));
                   int32_t serverid_i32 = (int32_t) serverid;
                   BSON_ASSERT (bson_append_int32 (&cursor_opts, "serverId", 8, serverid_i32));
-                  // Use same session.
-                  if (!mongoc_client_session_append (parts.assembled.session, &cursor_opts, &error)) {
+                  // Use same session if one was applied.
+                  if (parts.assembled.session &&
+                      !mongoc_client_session_append (parts.assembled.session, &cursor_opts, &error)) {
                      _bulkwriteexception_set_error (ret.exc, &error);
                      _bulkwriteexception_set_error_reply (ret.exc, &cmd_reply);
                      goto batch_fail;

src/libmongoc/tests/test-mongoc-bulkwrite.c

@@ -497,8 +497,8 @@ test_bulkwrite_install (TestSuite *suite)
                       test_bulkwrite_session_with_unacknowledged,
                       NULL /* dtor */,
                       NULL /* ctx */,
-                      test_framework_skip_if_max_wire_version_less_than_25 // require server 8.0
-   );
+                      test_framework_skip_if_max_wire_version_less_than_25, // require server 8.0
+                      test_framework_skip_if_no_sessions);
 
    TestSuite_AddFull (suite,
                       "/bulkwrite/double_execute",