BUG: Fix merging non-indexes causes Index dtype promotion in when keys are missing#28436

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dworvos wants to merge 1 commit intopandas-dev:masterfrom dworvos:fix_merge_non_index

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Commits on Nov 9, 2019

BUG: Fix merging non-indexes causes Index dtype promotion in when keys are missing from left or right side. (GH28220)
dworvos
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