Callback error ins not printed

whil pybind11 adaptation we changed the way, how we process errors in event callbacks: instead of sending it to cppTango (which does not work and has to be fixed) we try to print them, but this does not work:

/home/matveyev/miniforge3/envs/tango10_11/bin/python /home/matveyev/pytango/sandbox/server_for_tests_2.py 
Ready to accept request
Ready to accept request
push_event generated the following python exception:
push_event generated the following python exception: