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diff: Fix crash when remote object doesn't exist

Since we're saving nil in an interface rather than the implementation,
we can't compare to nil to check if the remote object exists or
not. Change the struct to save in the implementation.



**What this PR does / why we need it**:

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```