fix(models): enforce string type for default value when 'NULL'

[guillaumedeslandes]

Some "NULL" where included in models without quoting due to non-string type for database fields.

eg: DB column type numeric(12,2) and default value NULL::numeric.

Linked to: CU-78nvya

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[arnaudbesnier]

Task linked: CU-78nvya P1 - Lumber Analyzer generates models where fields have a defaultValue equal to NULL - not accepted by Sequelize.Model

[slimee]

It works as expected I guess:

[slimee]

You can edit, and null values from db display empty cell.

But when you create a record without specifying a value for a numeric/default null field, it display NaN instead of displaying an empty cell.

[forest-bot]

:tada: This PR is included in version 3.6.11 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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