Crach when ENTER key is pressed in the Alpine minimal image

[nicolargo]

Trace:

File "<frozen runpy>", line 198, in _run_module_as_main
File "<frozen runpy>", line 88, in _run_code
File "/app/glances/__main__.py", line 18, in <module>
glances.main()
File "/app/glances/__init__.py", line 184, in main
start(config=core.get_config(), args=core.get_args())
File "/app/glances/__init__.py", line 130, in start
mode.serve_forever()
File "/app/glances/standalone.py", line 181, in serve_forever
while self.__serve_once():
^^^^^^^^^^^^^^^^^^^
File "/app/glances/standalone.py", line 160, in __serve_once
ret = not self.screen.update(self.stats, duration=adapted_refresh)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/glances/outputs/glances_curses.py", line 1252, in update
self.flush(stats, cs_status=cs_status)
File "/app/glances/outputs/glances_curses.py", line 1198, in flush
self.display(stats, cs_status=cs_status)
File "/app/glances/outputs/glances_curses.py", line 738, in display
new_filter = self.display_popup(
^^^^^^^^^^^^^^^^^^^
File "/app/glances/outputs/glances_curses.py", line 1029, in display_popup
popup.addnstr(2 + y, 2, m, len(m))
_curses.error: addnwstr() returned ERR
make: *** [Makefile:216: run-docker-alpine-minimal] Error 1

Works fine with non Docker image.
Works fine with Ubuntu based Docker image.

[nicolargo]

Merged into develop