Missing test data for journey graphs
Extract collection creation for test
Spec for handling missing data on application series.
Count last available weeks based on provided data.
Count last completion rate weeks based on provided data.
Spec for calculation week completion rate with missing data
If missing data, completion is null.

It was a NaN before, now should be a null.
Pad data with null instead of 0.

We are using null to indicate no data. This is more accurate, since 0
indicates there were 0 events.
Pads missing application data with null instead of 0.

Same reason as for the completion rate. Missing data should not be
displayed as 0, as it's misleading.
Calculate the total number of weeks on the series

To be used when displaying the number of weeks and the number of weeks
without data
Assert full text of the volumetrics single stat
WIP tests for displaying unavailable weeks
Volumetrics series return weeks as an object.
Display unavailable weeks for application series
Display unavailable weeks for completion rate
Unify view for submissions and completion rate.
Rename allowNull to allowMissingData
Makes onHover test more readable
Introduce param to allow hovering over missing data
Handle null as missing data when formatting label