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When a user cohort or metric is not found flag this as an error to the user.

Validate cohort names in URL. Write a method to validate from usertage_meta table.

See the output and cohort views in https://github.com/rfaulkner/E3_analysis/blob/master/user_metrics/api/views.py

Call validation in views.py on cohort names at the following points:

https://github.com/rfaulkner/E3_analysis/blob/master/user_metrics/api/views.py#L186
https://github.com/rfaulkner/E3_analysis/blob/master/user_metrics/api/views.py#L241

(porting ticket to Wikimetrics)

This issue doesn't apply to Wikimetrics for requests generated by users via the UI. Cohort and metric validation still needs to be implemented for programmatic access to Wikimetrics, see https://mingle.corp.wikimedia.org/projects/analytics/cards/1104

[moving tickets as per bug 65903]