Fix sqlalchemy with osprofiler

Breakage seen in magnum-capi-helm unit tests after [1].

[1]: https://review.opendev.org/c/openstack/magnum/+/927446

Closes-Bug: #2089934

Change-Id: I3e5560dd487525d9566930772b0c56d52d974500

Author: mnasiadka

magnum/db/sqlalchemy/api.py

@@ -64,7 +64,8 @@ def _session_for_write():
 
 
 def _wrap_session(session):
-    if CONF.profiler.enabled and CONF.profiler.trace_sqlalchemy:
+    if (hasattr(CONF, 'profiler') and CONF.profiler.enabled and
+       CONF.profiler.trace_sqlalchemy):
         session = profiler_sqlalchemy.wrap_session(sa, session)
     return session