Handle 'conflicting data from submitters' clinsig value in clinical assertions

[theferrit32]

ERROR g.t.clinvar.clinical-assertion - {:fn :clinsig-and-statement-type-to-predicate, :msg "Could not interpret clinsig", :clinsig "conflicting data from submitters", :stmt-type "VariationGermlinePathogenicityStatement", :line 364}