fun <T> Sequence<T>?.orEmpty(): Sequence<T>
Returns this sequence if it's not null and the empty sequence otherwise.
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
val nullSequence: Sequence<Int>? = null
println(nullSequence.orEmpty().toList()) // []
val sequence: Sequence<Int>? = sequenceOf(1, 2, 3)
println(sequence.orEmpty().toList()) // [1, 2, 3]
//sampleEnd
}
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.sequences/or-empty.html