Avoid NPE when replacement property does not exist#15394

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hdeadman wants to merge 2 commits intospring-projects:masterfrom

hdeadman:propmigrator

Commits on Dec 5, 2018

Avoid NPE when replacement property not found in map.
hdeadman
committed

Commits on Dec 7, 2018

Add test that shows unknown replacement property doesn't cause NPE.
hdeadman
committed