Catch MemoryException in editor

[vasekch]

https://github.com/octopusengine/octopuslab/blob/d435c16323f2a0250108b9d2a150bf3277d0f2d0/esp32-micropython/util/shell/editor.py#L175

uPyShell:~/$ edit util/octopus.py
Traceback (most recent call last):
File "util/shell/init.py", line 527, in shell
File "util/shell/init.py", line 145, in edit
File "util/shell/editor.py", line 175, in edit
MemoryError: memory allocation failed, allocating 2048 bytes