IOTA creates attribute with blank value when there is a mapping #938
Description
When a device is provisioned with a mapping (e.g. modify the name of a device attribute) the IoTA is creating the entity attribute in Context Broker with value " ".
This value (" ") is provoking e2e errors in database since some attributes are defined as numeric in database.
Moreover, it is not clear if the attibute should be created in the device provision. It sounds more sensible that the attribute to be created with a received measure.
Besides, if a measure is received with several attributes, but the mapped attribute is not present in the measure, the attribute should not be updated in the Context Broker.