The Kotlin stdlib provides some functions that are designed to operate on references that may be null. These functions can also be called on non-nullable references or on collections or sequences that are known to be empty - the calls are redundant in this case and can be removed or should be changed to a call that does not check whether the value is null or not.

Noncompliant Code

val testList = listOf("string").orEmpty()
val testList2 = listOf("string").orEmpty().map { _ }
val testList3 = listOfNotNull("string")
val testString = ""?.isNullOrBlank()

Compliant Code

val testList = listOf("string")
val testList2 = listOf("string").map { }
val testList3 = listOf("string")
val testString = ""?.isBlank()