fix: handle null values in opData

[DominicGBauer]

Description

An issue arose when we wanted to change a value from a non-null type to null in uploadData function. This was a result of opData always returning strings and therefore returning "null" and not null. The uploadData function tried to upload data to the postgres db which would result in for example:

Data upload error - retrying last entry: CrudEntry<3/3 PATCH todos/d6b6d112-e779-4389-a7b4-34c45808ecdc {completed=0, completed_at=null, completed_by=null}>, io.github.jan.supabase.exceptions.BadRequestRestException: invalid input syntax for type timestamp with time zone: "null"

Work Done

Added a case to handle null values in opData.

Video

Video shows values returning true when not null and false when null in the console. Also no errors are shown where previously the error above would be shown.

Screen.Recording.2024-08-14.at.16.29.13.mov