Rollup merge of #140052 - GuillaumeGomez:fix-140026, r=nnethercote
Fix error when an intra doc link is trying to resolve an empty associated item Fixes https://github.com/rust-lang/rust/issues/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```
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