Error not handled when using an invalid File Link

[gabriel-gfs]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Add Package'
2. Set File Url to 'https://download.documentfoundation.org/libreoffice/stable/24.2.1/win/x86/LibreOffice_24.2.1_Win_x86.msi'
3. Add Package
4. Error appears

Expected behavior
An Error is shown saying that the url is invalid because the file cannot be found.

Screenshots

General Information:

• WinGetty Version 1.0.0

Additional context
It would also be cool if the Installer Type is preselected automatically depending on the file extension of the file from the Url.