Bcftools liftover - reference check alwys fails on symbolic variants

[davmlaw]

I added a check to ensure variant matched reference, but this always fails for symbolic variants as they have a single base ref then symbolic alt, rather than full explicit ref:

Example variant: NC_000001.10:g.145505732_145513588del

{ "error_message": "Validation Error: reference='C' not equal to calculated ref from genome C ....GATCGTGCCAT" }

Symbolic alt will always match reference as I am pulling it out, so we should just skip the check here

[davmlaw]

Upon deploy this should fix up anything currently stuck

example on shariant test: NC_000001.10:g.10036359_10043727dup