Error when opening a file whose path contains spaces

When I try something like this:
```
mkdir /tmp/foo\ bar
vim /tmp/foo\ bar/test.journal
```
then vim reports an error on startup:
```
Error detected while processing /home/user/.vim/pack/bundle/start/vim-ledger/compiler/ledger.vim:
line   31:
E518: Unknown option: bar/test.journal'\ print\ \ >\ /dev/null)
```