Issue Summary

Two dimensional filter statistics gadget does not show empty (none) values, when the custom field of multiple select is in Y-axis.

Note: if this problem is not reproduced following below steps. Set a value to TEST-3, then clear it (set to None).

Steps to Reproduce

1. Create a test project (TEST)
2. Create a multiple select custom field (Test Multiple Select) with option: AA, BB
3. Apply the field to the project
4. Create a test ticket (TEST-1)and set the field with value of AA
5. Create a test ticket (TEST-2)and set the field with value of BB
6. Create a test ticket (TEST-3), not set the field (keep the value as none)
7. Create a two dimensional filter statistics gadget, and select the project as filter 
8. Set Status as  X-axis, and the custom field as Y-axis,
9. The ticket is showing in the gadget

Expected Results

None option (empty value) should be list in the gadget.

Actual Results

Only the rows of AA and BB options are shown in the gadget

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available