W-ASAP: Variant explorer: inform/warn users when they use very few sequences to define their signification mutations

[fhennig]

From @DrYak:

on GenSpectrum / Variant Explorer some warning box (on top of the table? right under the input box?) whenever people write a query that yield to few sequences.
e.g., when people write "BA.3.2*" in the "Define Clinical Signature / Variant" input box, they should get a warning "There are only 18 sequences machthing 'BA.3.2*' on covSPECTRUM right now".
To nudge people to be more lenient with the variant filters they add.

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I was thinking, maybe we could always have some info box that shows how many clinical sequences were involved.