Conditions can't be deleted
Current behaviour:
When deleting a previously set condition (by updating the condition, deleting any previously made configuration and saving the condition), the condition type stays active (without a set parameter).
Expected benhaviour:
When deleting a previously set condition (by updating the condition, deleting any previously made configuration and saving the condition), the condition is actually deleted. The condition's configuration screen looks as if no condition was ever set up.