Question How to import an animated blender file, but ignore some objects animation ?

Hi everyone,
All is in the question!
I tried doing this already :

But it doesnt seems to work...
I have TONS of 'empty' animation layers, that are making my unity hold for some time 20 minutes lol...

By empty, I mean, unity create the animation with a static first frame for all object, and a static end frame for all objects..

Please help!