Fixed : dictBuilder fails if first sample is too small
Fixed : dictBuilder fails if first sample is too small

Cyan4973/zstd,ds77/zstd,Majlen/zstd,Cyan4973/zstd,Cyan4973/zstd,inikep/zstd,inikep/zstd,inikep/zstd,Cyan4973/zstd,inikep/zstd,Majlen/zstd,ds77/zstd,Majlen/zstd,Cyan4973/zstd,Majlen/zstd,ds77/zstd,ds77/zstd