build
fun buildRefBlockVariantInfoZeroDepth(refSequence: Map<String, NucSeq>, chrom: String, currentRefBlockBoundaries: Pair<Int, Int>, assemblyChrom: String, currentAssemblyBoundaries: Pair<Int, Int>, assemblyStrand: String, isMissing: Boolean = false): AssemblyVariantInfo
Method to build a Reference Block AssemblyVariantInfo setting the depth to 0. This is mainly used to fill in missing basepairs between MAF entries. NucSeq is 0-based, so subtract 1 from the boundary value when grabbing sequence allele