Three situations that cause the program to crash

[DES Alfonso Cano Robles]

I hope you're all doing well.

I just wanted to let you know that I've found three bugs that cause the
program to crash.
* The first occurs when the data editor window is split.
* The second happens when saving the RData file.
* The third occurs when trying to execute a command that requires creating
a new output file.

This is the appimage version I have been using.

```
URL '
https://cdn.kde.org/ci-builds/education/rkward/master/linux/rkward-master-2428-linux-gcc-x86_64.AppImage
'
Content type 'unknown' length 400685560 bytes (382.1 MB)
==================================================
downloaded 382.1 MB
```

This is also happening on Windows installations.

Any help to avoid this (workarroung) is much appreciated.

Thanks

I have attached a few frontend and backend files; I hope they help.

Regards

Alfonso
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