Multiple Metrics Chart View -> Graph View Omits First Date From Range Queried

[quadrophobiac]

Expected Behaviour

transitioning from pie chart view to graph view should display the full date range under examination

Steps to Reproduce (for problems)

Provide a link to a live example, or an unambiguous set of steps to reproduce this bug. Include code to reproduce, if relevant

1. go to https://demo.bothan.io/metrics/metric-with-multiple-values/
2. change view from pie to graph via visualisation types tab
3. switch to dates, confirm that From date is 5 days less than to date. confirm via https://demo.bothan.io/metrics/metric-with-multiple-values/all that there should be 5 entries in the array

possibly related to #253 as https://demo.bothan.io/metrics/metric-with-multiple-values/all renders if view is set to pie, but returns not found when set to chart