Handle empty lucky number response

src/main/kotlin/io/github/wulkanowy/api/repository/HomepageRepository.kt

@@ -64,7 +64,9 @@ class HomepageRepository(private val api: HomepageService) {
     @Deprecated("Deprecated due to VULCAN homepage update 19.06", ReplaceWith("getKidsLuckyNumbers()"))
     fun getLuckyNumber(): Maybe<Int> {
         return api.getKidsLuckyNumbers().compose(ErrorHandlerTransformer()).map { it.data }
-            .map { it[0].content[0].name }
+            .map { it[0].content }
+            .filter { it.isNotEmpty() }
+            .map { it[0].name }
             .filter { it.isNotBlank() }
             .map { it.substringAfterLast(": ").toInt() }
     }

src/test/kotlin/io/github/wulkanowy/api/homepage/HomepageTest.kt

@@ -78,4 +78,13 @@ class HomepageTest : BaseLocalTest() {
         val number = repo.getLuckyNumber().blockingGet()
         assertEquals(18, number)
     }
+
+    @Test
+    fun getLuckyNumber_empty() {
+        server.enqueue(MockResponse().setBody(HomepageTest::class.java.getResource("GetEmpty.json").readText()))
+        server.start(3000)
+
+        val number = repo.getLuckyNumber().blockingGet()
+        assertEquals(null, number)
+    }
 }

src/test/resources/io/github/wulkanowy/api/homepage/GetEmpty.json

@@ -0,0 +1,16 @@
+{
+  "data": [
+    {
+      "IkonkaNazwa": null,
+      "Num": null,
+      "Zawartosc": [],
+      "Nazwa": "",
+      "Url": null,
+      "Symbol": null,
+      "Nieaktywny": false
+    }
+  ],
+  "success": true,
+  "errorMessage": null,
+  "feedback": null
+}