Leading or trailing space in attr_key-attr_value pairs is discouraged

[serge2016]

Hello!
This line https://github.com/ucscCancer/fpfilter-tool/blob/master/fpfilter.pl#L498 seems to cause problems, according to https://github.com/vcftools/vcftools/blob/master/src/perl/Vcf.pm#L3028

vcf-annotate FAILES on fpfiltered VCF-file:
Error 1:

Leading or trailing space in attr_key-attr_value pairs is discouraged:
       [ InputVCFSource] [fpfilter]

Error 2:

Can't use string ("--vcf-file /outputs/77013075gdc."...) as a HASH ref while "strict refs" in use at /soft/vcftools-0.1.16/share/perl/5.26.1/Vcf.pm line 2950, <__ANONIO__> line 196.

Specification (https://docs.gdc.cancer.gov/Encyclopedia/pages/TCGA_VCF_1.1v2/) doesn't help to fix this line...
For now I had to simply change the line:

# push @$parsed_header, qq{##vcfProcessLog=<InputVCF=<$input>, InputVCFSource=<fpfilter>, InputVCFVer=<6.0>, InputVCFParam=<"$param_string"> InputVCFgeneAnno=<.>>\n}, $column_header;

push @$parsed_header, qq{##fpfilterCommand="$param_string"\n}, $column_header;