VRFS-3007 : Fix another bad method reference, and some more tests.

web/app/views/api_search/index.rabl

@@ -17,7 +17,7 @@ if @search.is_a?(MusicianSearch)
   end
          
   node :filter_json do |foo|
-    @search.json
+    @search.to_json
   end
          
   child(:results => :musicians) {
@@ -106,7 +106,7 @@ if @search.musicians_filter_search?
   end
          
   node :filter_json do |foo|
-    @search.json
+    @search.to_json
   end
          
   child(:results => :musicians) {