Report when custom variable values are empty, grouped in "Value not defined"
|Reported by:||matt||Owned by:|
|Priority:||normal||Milestone:||1.6 Piwik 1.6|
We should report the custom variable values that are empty and group them under a "Not defined" category.
Also, let's make sure that "Product category not defined" for ecommerce items rows for Ecommerce views metrics (visits,actions,etc.) are reported in the Ecommerce reports as a result.