[OE-core] Should patchtest warn on Upstream-Status: Pending ?

[Adrian Bunk]

I am wondering whether patchtest should send warning emails on
   Upstream-Status: Pending

In practice patches are usually forwarded upstream either at submission 
or never.[1]

Not upstreamed OE-only patches create a technical debt that often makes 
recipe upgrades a pain.

cu
Adrian

[1] When upstream requires copyright assignment upstreaming
    later is sometimes not even legally possible.