Incremental Refresh from TE3 Gets Nebulous Type Conversion Error

So, since I posted this, I have gotten the model to refresh.  Strangely, the thing that "unstuck" it was to refresh a full yearly or quarterly partition, before refreshing any of the more recent daily partitions.  These daily partitions didn't have any data in the source, which I think might be what caused the issue.  And I don't think it was the actual partition refresh that was failing but the post-refresh calculation that occurs.  You see, my dimDate table is DAX-based and it looks at the fact tables to determine the data ranges it needs to have. 

------------------------------------------------------------
--
-- Configuration
--
------------------------------------------------------------
--All the information needed to understand this table can be found here: 
--https://www.sqlbi.com/articles/reference-date-table-in-dax-and-power-bi/
--and here: https://github.com/sql-bi/DaxDateTemplate
------------------------------------------------------------


VAR TodayReference = TODAY ()
VAR CalendarFirstDate =
DATEVALUE (
    FORMAT (
        MIN (
            'factPayments'[DATE_WID]
        ),
        "####-##-##"
    )
)

VAR CalendarLastDate =
DATEVALUE (
    FORMAT (
        MAX (
            'factPayments'[DATE_WID]
        ),
        "####-##-##"
    )
)

VAR FirstYear = YEAR ( CalendarFirstDate )
VAR LastYear = YEAR ( CalendarLastDate )
VAR FiscalCalendarFirstMonth = 1 -- For Fiscal 52-53 weeks (start depends on rules) and Gregorian (starts on the first of the month) 

So, I think when those daily partitions try to refresh, and there is no data in them, it makes the post-refresh calculation associated with dimDate fail.  Which fails the whole partition refresh.