169f211 Fixes #2676
169f211 Fixes #2676

 * Now tracking custom variables with empty value in setEcommerceView
 * Now aggregating custom variables with empty value under a label "Value not defined" (in english always)
 * Updated tests and refactored code in API instead of archiving

piwik/piwik-dotnet-tracker,piwik/piwik-dotnet-tracker,piwik/piwik-dotnet-tracker