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(cherry picked from commit b75b9047)

(cherry picked from commit e4baa723)

gatk.tools.CatVariants outputs an empty file when input files don't contain anything, added a script that writes 2 VCF-file header lines to that empty output file

when Delly doesn't find variants from data then it doesn't generate an output file either, in Biopet it's needed that there would be at least an empty VCF-file after running the tool, so added script that does that, generates an empty VCF file when Delly hasn't found anything