Hi,
The your collada file seems fine and it exports a valid anim file through Facerig importer.
I didn't found a problem with this specific file.

you can see the exported anim file here:
https://drive.google.com/file/d/0B8KlsC2kpc7nRnFFV3NjWmJuYWM/view?usp=sharing

took a vidao during import.
https://www.dropbox.com/s/rzdp0efpizh2qro/visime.mp4?dl=0
so using same file but exports different anim file?
are we sure that we are using same importer?

Empty anim files are generated in two cases: if a "export selected" is performed with nothing selected or if the scene is empty... Since the importer doesn't use "export selected" option maybe it gets an empty scene. However the collada file you've send me was containing a skeleton so this shouldn't happen.
To see what's going on maybe you could give us other sources like geometry file and idle animation file. This would enable us to make a complete import process with your data.

part of geometry file is here.Importer still exports empty visime files with it.
https://www.dropbox.com/s/z10fanhblonewki/reimuGeometry.dae?dl=0
and idle1
https://www.dropbox.com/s/dimua1fuqq0sglk/idle1.dae?dl=0