Vcf validator and assembly checker were showing warning of empty vcf file twice.
srb@srb-pc:$ ./vcf_validator < empty.vcf
[info] Reading from standard input...
[warning] The VCF file provided is empty
[warning] The VCF file provided is empty
[info] Summary report written to : stdin.errors_summary.1536273054595.txt
[info] According to the VCF specification, the input file is not valid
Vcf validator and assembly checker were showing warning of empty vcf file twice.
This PR will fix that issue.