Add error logging in case committing session fails..

probably need to add a retry somewhere but still not getting the
traceback we need to figure that out...

rattail_tempmon/client.py

@@ -89,7 +89,11 @@ class TempmonClient(Daemon):
                 # make sure we show as being online
                 if not client.online:
                     client.online = True
-                session.commit()
+                try:
+                    session.commit()
+                except:
+                    log.exception("failed to commit changes to database")
+                    raise
 
             finally:
                 session.close()