Report Generator: graph_and_report gives error

[jadamchick]

When following the example laid out in the wiki / pages about how to use graph_and_report, using the exact example (with updated filter name to reflect current outputs) or a similar format with different filters, it gives an error and does not produce a graph.

The error is:
Error plotting 'Last Year's Average Cow Body Weight (kg)' data set. Unforeseen error 'NoneType' object has no attribute 'start_date' when trying to graph data.

Steps to Reproduce

1. Include the following in a report filter:
   {
   "name": "Last Year's Average Cow Body Weight (kg)",
   "filters": [
   "AnimalModuleReporter.report_herd_statistics_data.avg_cow_body_weight"
   ],
   "slice_start": -365,
   "graph_and_report": true,
   "graph_details": {
   "type": "plot",
   "filters": [
   "AnimalModuleReporter.report_herd_statistics_data.avg_cow_body_weight"
   ]
   }
   }

Note: this is copy/pasted from the example in the wiki, just with the filter updated from AnimalModuleReporter.report_life_cycle_manager_data.avg_cow_body_weight to AnimalModuleReporter.report_herd_statistics_data.avg_cow_body_weight to reflect updated output names

Context (Environment)

Detailed Description

Possible Implementation

Target Deadline