[Rpm-maint] [rpm-software-management/rpm] CONTRIBUTING.md: document that NULL is usually interpreted “invalid argument” or similar (Issue #1901)

[Demi Marie Obenour]

See https://github.com/rpm-software-management/rpm/pull/1801#discussion_r733414153 for the motivation for this issue.  Hopefully putting this in CONTRIBUTING.md will help prevent others from making the same mistake I did.

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