CI Failure: OplogJUnitTest.testEntryAlreadyWrittenIsCorrectlyUnmarkedForOverflowOnly

This test is intermittently failing due to an NPE. This test began to fail with commit 69443dadad91c1fba548c5562267938bfbe53f6a (GEODE-4598). GEODE-4598 turned on by default a new eviction algorithm which would now be used in all tests that utilize eviction but do not manually set the system property to choose an algorithm (such as this test). It needs to be determined why the new algorithm causes this failure and to fix the issue.