don't count facet on blank values

[Aman Tandon]

Hi,

Is this possible to not to count the facets for the blank values?
e.g. cat:

"cats":[*        "",34324,*
        "10",8635,
        "20",8226,
        "50",5162,
        "30",759,
        "100",188,
        "40",13,
        "200",7]

How is this possible?

With Regards
Aman Tandon