String operators testing error breakdown (CqlStringOperatorsTest)

[bryantaustin13]

CqlStringOperatorsTest fails commentary:

1. "passCount": 75,
   "skipCount": 0,

   "failCount": 6,
   "errorCount": 0

2. failing tests caused by server:
   CombineEmptyList (actual vs null) Engine error. See Combine({}) returns '' instead of null clinical-reasoning#869 (comment)
   DateTimeToString2 (actual includes timezone 2000-01-01T15:25:25.300+00:00)
   LowerEmpty (actual undefined vs '') Engine error. See Lower('') should return an empty string instead of no value clinical-reasoning#874 (comment)
   UpperEmpty (actual undefined vs '') Engine error. See Upper('') should return an empty string instead of no value clinical-reasoning#875 (comment)
   SplitABNull (actual "a,b" vs list of {'a,b'}) Engine error: Split('a,b', null) should return null, but returns a valueString clinical-reasoning#877 (comment) (also a test error. It should expect a null)
   AND the following is the issue to fix the test.
   CqlStringOperatorsTest.xml:: SplitABNull should expect null not {'a,b'} cql-tests#92 (comment)
   SplitABDash (actual "a,b" vs list of {'a,b'}) Engine error: Split('a,b', '-') should return a list, but returns a valueString clinical-reasoning#878 (comment)