RevEng: varchar column with default null constraint generates warning

[StevenBonePgh]

The command

Scaffold-DbContext -Connection "<connection string>" -Provider EntityFramework.SqlServer

Generates the following warning

Unable to interpret the string ULL as a SQLServer string literal.
For column [dbo][MyTable][SomeVarchar] unable to convert default value (NULL) into type System.String. Will not generate code setting a default value for the property [dbo][MyTable][SomeVarchar] on entity type [dbo][MyTable].

If [MyTable][SomeVarchar] column is defined as [NullableInt16] [SomeVarchar](6) NULL,
and the following constraint exists

ALTER TABLE [dbo].[MyTable] ADD  CONSTRAINT [DF_MyTable_SomeVarchar]  DEFAULT (NULL) FOR [SomeVarchar]

[lajones]

Fixed with PR #3350