Fix nil pointer dereference panics in mlserver #3047
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Fixes #2904
The panics in #2904 are caused by nil pointer dereference of
*machinelearningv1.PredictiveUnitingetMLServerImage. I found this out by running the tests with-count=20to trigger the flakiness and followed the logs. In general we should be checking for nil pointer dereference issues before using a pointer that can be nil - this is a panic waiting to happen :D There are linters that can check for this - I will look into adding some to the repo.