SnpSift gwasCat: duplicated entries in GWASCAT_* INFO fields

[leeyb9916]

Describe the issue
After running SnpSift gwasCat, the GWASCAT-related INFO fields contain the same values repeated multiple times within a single record.

For example, if the GWAS catalog DB has 4 entries associated with a given position, the GWASCAT fields end up containing 4 * 4 = 16 entries — i.e. the values are repeated by a factor of N.

For example, given the following two entries in the GWAS catalog DB for the same position:

PUBMEDID	CHR_ID	CHR_POS	MAPPED_TRAIT
31562340	2	219055182	body height
35831902	2	219055182	body height

the SnpSift gwasCat output VCF reports the trait 2 * 2 = 4 times:

CHROM	POS	GWASCAT_TRAIT
2	219055182	Height,Height,Height,Height

To Reproduce

1. SnpEff version: 4.2 and 5.3a
2. Genome version: hg38
3. SnpEff full command line: java -jar Snpsift.jar gwasCat -v -db ${gwas_database} ${input_vcf} | bcftools view -Oz > ${output_vcf}