[PR] Fix the detection of field deletion in diffs

[kopf-archiver]

A pull request by nolar at 2019-05-22 14:19:03+00:00
Original URL: zalando-incubator/kopf#70
Merged by nolar at 2019-05-23 23:24:12+00:00

Issue : #13

As accidentally detected during #69 — this fixes a little issue with KeyError raised when the field is removed from the object, and a field-handler is called for that event, and fails to "resolve" the old/new value for the field-handler (i.e. a subset of a bigger diff-object), as the field is not in one of those per-object old/new structs.