Wishlist: `query whatinputs` should not abort just because one file isn't an input

[hemflit]

While whatoutputs does a reasonable thing:

$ please query whatoutputs foo bar
Error: 'foo' is not a product of any current target
Error: 'bar' is not a product of any current target

... whatinputs aborts on first failure:

$ please query whatinputs foo bar
11:08:31.689 CRITICAL: foo is not a source to any current target

This makes xargs-ing or piping into the command harder.

[stale[bot]]

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[hemflit]

This is still happening.