Ctrl+F creates an empty file

I was just trying out vimpager.
I opened a long file with spaces in its name and when scrolling
using Ctrl+F, it redirected me to an empty file after a few keypresses.
To reproduce:
```
repeat 50 { echo } > 'some file with spaces.txt'
vimpager 'some file with spaces.txt'
4<C-F>
<C-F>
```
You should be in an empty file named 'spaces.txt'.
