Reject silence-only fingerprints

[Lukáš Lalinský]

Fingerprint like this shouldn't get into the database:

track_id | 226564
id | 237674
bitrate | 320
length | 60
source_id | 9
fingerprint | {896273685,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279,627964279}