If you are experiencing the issue described above in PS 1.7.7.1, then the fast and most comfortable fix is to download 1.7.7.0 and copy the faceted search folder into modules of your 1.7.7.1 installation. Overwrite everything and done. If you want it the more challenging way, you can go and update the 1.7.7.1 files manually.
Edit History
If you are experiencing the issue described above in PS 1.7.7.1, then the fast and most comfortable fix is to download 1.7.7.0 and copy the faceted search folder into modules. Overwrite everything and done. If you want it the more challenging way, you can go and update the 1.7.7.1 files manually.