Gene symbol HGVS search - report errors

[davmlaw]

Raised from SACGF/variantgrid_private#3634

If you search for BMD:c.10889G>A

It returns some results. However, we also swallow the errors, eg:

Error resolving transcripts: ENST00000378043.9 (MANE Select), NM_004183.4 (MANE Select): c.10889 coordinate is out of bounds

These are only reported if there are no results.

We would like to return the errors as well as the results - I am not sure how to do that as we yield SearchResult but if you throw an exception it just exits the function and never returns to get more results

Can we yield something that ends up looking like an exception?

[davmlaw]

Changes in #1105 now allow us to return SearchResult failures