Fix error when an intra doc link is trying to resolve an empty associated item #140052
+30
−1
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Fixes #140026.
Assigning @nnethercote since they're the one who wrote the initial change.
I updated rustdoc code instead of compiler's because I think it makes more sense that the caller ensures on their side that the name they're looking for isn't empty.
r? @nnethercote