Fix empty lists as parameter values

Author: serpro69

core/src/integration/kotlin/io/github/serpro69/kfaker/provider/AddressIT.kt

@@ -3,6 +3,7 @@ package io.github.serpro69.kfaker.provider
 import io.github.serpro69.kfaker.faker
 import io.kotest.assertions.throwables.shouldNotThrow
 import io.kotest.core.spec.style.DescribeSpec
+import io.kotest.matchers.shouldBe
 import io.kotest.matchers.shouldNotBe
 import io.kotest.matchers.string.shouldContain
 import io.kotest.matchers.string.shouldMatch
@@ -11,6 +12,17 @@ class AddressIT : DescribeSpec({
     describe("Address Provider") {
         val address: (locale: String) -> Address = { faker { fakerConfig { locale = it } }.address }
 
+        context("uk locale") {
+            context("empty list as a parameter value") {
+                it("cityPrefix() should return empty string") {
+                    address("uk").cityPrefix() shouldBe ""
+                }
+                it("citySuffix() should return empty string") {
+                    address("uk").citySuffix() shouldBe ""
+                }
+            }
+        }
+
         context("nb-NO locale") {
             it("city() does NOT throw NoSuchElementException") {
                 shouldNotThrow<NoSuchElementException> { address("nb-NO").city() }

core/src/main/kotlin/io/github/serpro69/kfaker/FakerService.kt

@@ -19,6 +19,7 @@ import io.github.serpro69.kfaker.provider.FakeDataProvider
 import io.github.serpro69.kfaker.provider.Name
 import io.github.serpro69.kfaker.provider.Tertiary
 import io.github.serpro69.kfaker.provider.YamlFakeDataProvider
+import org.w3c.dom.ranges.RangeException
 import java.io.InputStream
 import java.util.*
 import java.util.regex.Matcher
@@ -304,8 +305,10 @@ internal class FakerService {
 
         return when (parameterValue) {
             is List<*> -> {
-                when (val value = randomService.randomValue(parameterValue)) {
-                    is List<*> -> RawExpression(randomService.randomValue(value) as String)
+                if (parameterValue.isEmpty()) RawExpression("") else when (val value = randomService.randomValue(parameterValue)) {
+                    is List<*> -> {
+                        if (value.isEmpty()) RawExpression("") else RawExpression(randomService.randomValue(value) as String)
+                    }
                     is String -> RawExpression(value)
                     is Int -> RawExpression(value.toString())
                     else -> throw UnsupportedOperationException("Unsupported type of raw value: ${parameterValue::class.simpleName}")