vrfs-988: fixed broken musician filter test

web/spec/requests/musician_search_api_spec.rb

@@ -53,13 +53,13 @@ describe "Musician Search API", :type => :api do
       it "gets musicians for default instrument" do
         get_query({:instrument => 'electric guitar'})
         good_response
-        expect(json.count).to be >= 1
+        expect(json['musicians'].count).to be >= 1
       end
 
       it "gets no musicians for unused instruments" do
         get_query({:instrument => 'tuba'})
         good_response
-        expect(json.count).to eq(0)
+        expect(json['musicians'].count).to eq(0)
       end
 
     end