revised _add_to_siri in agg_response/point_series to handle falsey data, closes #2195
Closes #2126 - Remove Rack::Deflator because it doesn't work on JRuby
Merge pull request #2199 from simianhacker/fix-2126

Closes #2126 - Remove Rack::Deflator because it doesn't work on JRuby
Merge pull request #2198 from jthomassie/fix/falsey-values

fix falsey legend values