format/diff: fix panic with null map in NestedType attrs #29206
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mildwonkey
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1.0-backport
jbardin
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Jul 21, 2021
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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