fix: reporting the attribute who lost their value

[gpuligundla]

This PR Address the #218 issue.

Describe the bug
For example, going from:

class A:
    b: int | None = None

to

class A:
    b: int

will report

Attribute value was changed: None -> None

Now modified to

Attribute value was changed: None -> unset

[pawamoy]

Thanks!

It would be better to pass "unset" to the breakage instance rather than modifying the value in the actual attribute 🙂

[gpuligundla]

Thanks!

It would be better to pass "unset" to the breakage instance rather than modifying the value in the actual attribute 🙂

Changed it

[pawamoy]

Thanks. I realise it needs an else clause, otherwise it would yield both breakages.
Could you also add a test :) ?

[gpuligundla]

Thanks. I realise it needs an else clause, otherwise it would yield both breakages. Could you also add a test :) ?

ah! yeah sorry for being noob, i assumed it as return keyword

[pawamoy]

No worries! And thanks for the update 🙂 LGTM now, merging!