> AFAICS, the only method to get a 'space' index entry is having a > series of backslashes if 'txiindexbackslashignore' is set.
I have to correct myself. An index entry
```
@findex {}
```
also generates a line
```
\entry{ }{1}{\code {}}
```
However, it gets swallowed by `texindex`, so it doesn't create weird
output. Anyway, it probably makes sense to mention that braces are
not allowed in index entries.
Werner
