Handle missing concept errors from WS nicely

[angiehjort]

Problem 1
Load bubble chart
Switch Y to male salaried workers (male_salaried_workers_percent_of_non_agricultural_male_employment)
Observe a crash due to a missing concept

http://www.localhost:4200/tools/#$model$markers$bubble$encoding$y$data$concept=male_salaried_workers_percent_of_non_agricultural_male_employment&space@=country&=time;;&scale$domain:null&zoomed:null;;;;;;&chart-type=bubbles&url=v1

Would be nice to get it reported back to us automatically via GA or Rollbar

Problem 2
need to rename male_salaried_workers_percent_of_non_agricultural_male_employment and add a redirect of concept because of Gapminder/big-waffle#49

[angiehjort]

cases to test

• missing concept
• missing CSV file
• bad CSV file format (delimiter, columns, etc..)
• network is down (at different points in loading)
• asset is missing (world-50m.json)
• more...?

[jheeffer]

You cannot get a non-CORS error in tools page for this WS response. However, you can update DDFServiceReader to throw on a concept > 64 characters until either the concept-id-length or the CORS-without-access-origin issue is fixed. Or indeed just change the concept id to <= 64 chars.