Allow GRESB API Syncing of Blank Envizi Fields

Currently, if a particular field in GRESB is blank, that blank value will not be synced to GRESB via an API sync.  For example, if the Street Address value in Envizi is blank, and the current value in GRESB for the corresponding location is "123 Test Street", the GRESB value will remain "123 Test Street", even after the sync.  The only way to render the field blank from within Envizi is to apply the Clear function from within the GRESB Asset Summary with API screen.

The reasoning provided by IBM is that "treating blank fields as instructions to overwrite or delete existing values in GRESB could lead to undesired outcomes. Similarly, users may update field values directly in the GRESB web portal without first recording them in Envizi, and syncing blank fields from Envizi in such cases could inadvertently erase those updates in GRESB. By excluding blank fields, we aim to prioritize data integrity and prevent these unintended outcomes."

We disagree with this assessment.  GRESB data is accurate when it has parity with the source data (i.e., Envizi), even when the source field is blank.  While it is true that GRESB values previously provided directly into GRESB may be removed, if replaced by a blank value, the current GRESB values could just as easily be erroneous and in need of correction. 

Furthermore, relying on the Envizi user to clear GRESB fields on a location by location basis raises the risk of human error (e.g., a field that needs to be cleared is missed).