Install button shouldn't work if install path is empty #1234

Describe the bug

When trying to install a game, if the install path is empty, clicking the Install button closes the dialog with no information and nothing happens, and there's no indication of an error anywhere.

Add logs

not relevant

Steps to reproduce

1. Open the install dialog for a game
2. Make sure the Select Install Path field is empty
3. Click the Install button
4. Dialog closes, installation never starts, no errors are displayed anywhere (the code simply returns)

Expected behavior

Clicking the Install button shouldn't close the dialog and it should be clear what's the reason it's not installing.

I can imagine 2 options:

• disable the Install button if the input is empty (though we still need to show some indication that it can't be empty)
• leave the button enabled but show a message to the user if the input is empty

Screenshots

No response

System Information

• OS [e. g. "Ubuntu"]: Linux Mint
• Heroic Version [e. g. 2.1.1]: 2.3.0-beta.1

Additional information

No response