ctrl + c does not terminate orca - AttributeError: module 'signal' has no attribute 'strsignal'

Using orca git version 7751cb7a5c21d29b91778d1451b319b29039b899.

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pyatspi/registry.py", line 208, in eventWrapper
    def eventWrapper(self, event, callback):
  File "/usr/local/lib/python3.7/site-packages/orca/orca.py", line 718, in shutdownOnSignal
    (signum, signal.strsignal(signum))
AttributeError: module 'signal' has no attribute 'strsignal'
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pyatspi/registry.py", line 208, in eventWrapper
    def eventWrapper(self, event, callback):
  File "/usr/local/lib/python3.7/site-packages/orca/orca.py", line 718, in shutdownOnSignal
    (signum, signal.strsignal(signum))
AttributeError: module 'signal' has no attribute 'strsignal'

Therefore also orca no longer shuts down when receiving signal sigterm (by using kill -s sigterm pid-of-orca on the command line) which can can probably lead to the same issue as #188.

(Other tickets: I never saw this issue before. Only since git 7751cb7a5c21d29b91778d1451b319b29039b899 (but I didn't try many other git revisions to find out where it was introduced.))

#188 is a separate issue. Happened for me in earlier versions already without above error message.