Prevent segfault on empty tbi index #1845
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When an empty VCF file with a header but no data lines is indexed, tbx_seqnames() called via bcf_sr_add_reader() returns an empty list. Consequently, when bcf_sr_regions_next() is called and no in-memory regions are available, it attempts to read from a file which is not initialized. This fixes samtools/bcftools#2286
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When an empty VCF file with a header but no data lines is indexed, tbx_seqnames() called via bcf_sr_add_reader() returns an empty list. Consequently, when bcf_sr_regions_next() is called and no in-memory regions are available, it attempts to read from a file which is not initialized.
This fixes samtools/bcftools#2286