[IMP] core: avoid to process work when worker is 'killed' during sleep.

If a signal is received during the worker _runloop sleep,
the worker will be marked as alive=False but process_work
will still be called once.

This commit prevents that by checking the worker state before
calling process_work.

closes odoo/odoo#31885

Signed-off-by: Olivier Dony (odo) <odo@openerp.com>

odoo/service/server.py

@@ -763,6 +763,8 @@ class Worker(object):
             while self.alive:
                 self.multi.pipe_ping(self.watchdog_pipe)
                 self.sleep()
+                if not self.alive:
+                    break
                 self.process_work()
                 self.check_limits()
         except: