Remove nulls

[paulodamaso]

There are a lot of null usages in the project violating the key principles defined README.md file. These null constant references must be eliminated.

[paulodamaso]

@0crat in

[0crat]

@0crat in (here)

@paulodamaso Job #863 is now in scope, role is DEV

[0crat]

Bug was reported, see §29: +15 point(s) just awarded to @paulodamaso/z

[0crat]

The job #863 assigned to @krzyk/z, here is why; the budget is 30 minutes, see §4; please, read §8 and §9; if the task is not clear, read this and this; there will be a monetary reward for this job

[krzyk]

@paulodamaso What to do in case of receiving null from external libraries, or a call to external library requires null in params to enable some option?
In case of return params we could hide null inside Optional or Opt

I think the last time nulls were being removed (#555) here we stopped at those boundaries.

[paulodamaso]

@krzyk I think that we have to evaluate each case of null when communicating with other libraries, so let's not assume any default behavior for now.

Takes code deteriorated from last null removal to now; we have a lot of "new nulls" lurking in our own code right now. Let's take care of these ones first.

[krzyk]

@0crat wait I'm busy with other tasks

[0crat]

@0crat wait I'm busy with other tasks (here)

@krzyk The impediment for #863 was registered successfully by @krzyk/z

[0pdd]

@paulodamaso the puzzle #917 is still not solved.

[krzyk]

@paulodamaso please close this issue, it has been merged to master in #907

[paulodamaso]

@krzyk Great, thanks!

[0crat]

@ypshenychka/z please review this job completed by @krzyk/z, as in §30; the job will be fully closed and all payments will be made when the quality review is completed

[0crat]

The job #863 is now out of scope

[ypshenychka]

@0crat quality good

[0crat]

@0crat quality good (here)

@ypshenychka The project doesn't have enough funds, can't make a payment

[0crat]

@0crat quality good (here)

@ypshenychka The project doesn't have enough funds, can't make a payment

[0crat]

Order was finished, quality is "good": +35 point(s) just awarded to @krzyk/z

[0crat]

Quality review completed: +8 point(s) just awarded to @ypshenychka/z

[0pdd]

@paulodamaso the puzzle #unknown is still not solved.