Backport of format/diff: fix panic with null map in NestedType attrs into v1.0#29207
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Backport
This PR is auto-generated from #29206 to be assessed for backporting due to the inclusion of the label 1.0-backport.
The below text is copied from the body of the original PR.
writeNestedAttrDiffwasn't prepared to handle entirely null maps. This commit adds a test (which reproduced the panic before the fix) and the same map handling that's in the nested block format printer, which treats null maps as empty maps.Fixes #29205