Fix 'AttributeError: 'FieldInfo' object has no attribute 'disabled_on_mongo'

[Tinitto]

Why

Whenever fields were declared without Field() function, they would raise the Attribute error. AN example is shown below.

class School:
    name: str 

What was done

• Changed accessing 'disabled_on_mongo', 'disabled_on_sql' and 'disabled_on_redis' to use getattr() with a default False.