Convert date, turn NULLS blank and keep blanks?

I have a column in a query that contains some blanks, NULLS and dates (as YYYYMMDD). I need to convert the dates to MM/DD/YYYY, remove the NULLs and keep the blanks blank.

When I try...

isnull(convert(char(10), cast(mytable as datetime), 101),  '') 

the blanks turn to 01/01/1900, my NULLS become blank and my date converts. Any idea how to keep my blanks blank and not converting to 01/01/1900?

It is confusing to call a column "mytable", so I will call it "DateText" in this answer.

To prevent converting the empty string to '1900-01-01', you can use the isnull() function to temporarily map the empty value to null - isnull(DateText, ''). You already have logic that will map the null value back to an empty string after the conversion.

The updated expression would then be:

isnull(convert(char(10), cast(nullif(DateText, '') as datetime), 101),  '')

Results:

See this db<>fiddle.