Test fixes

- CD, Books, builders and classes fixed for shoppingTest acceptation

lm-challenge-lib/src/main/kotlin/com/lm/sales/builders/BookBuilder.kt

@@ -6,9 +6,9 @@ import com.lm.sales.model.stationery.Book
 class BookBuilder {
 
 	private lateinit var name: String
-	private lateinit var author: String
+	private var author: String? = null
 	private var pages: Int = 0
-	private lateinit var editorial: String
+	private var editorial: String? = null
 	private var isImported: Boolean = false
 	private var basePrice: Double = 0.0
 	private lateinit var taxes: Taxes

lm-challenge-lib/src/main/kotlin/com/lm/sales/builders/CDBuilder.kt

@@ -5,9 +5,9 @@ import com.lm.sales.model.music.CD
 class CDBuilder {
 
 	private lateinit var discName: String
-	private lateinit var artist: String
+	private var artist: String? = null
 	private var tracksNumber: Int? = null
-	private lateinit var label: String
+	private var label: String? = null
 	private var isImported: Boolean = false
 	private var basePrice: Double = 0.0
 

lm-challenge-lib/src/main/kotlin/com/lm/sales/model/music/CD.kt

@@ -8,9 +8,9 @@ import com.lm.sales.model.Taxes
  * @author j.hernandez
  */
 data class CD (override val name: String,
-			   override val mainArtist:  String,
+			   override val mainArtist: String?,
 			   override val tracks: Int?,
-			   override val recordLabel: String,
+			   override val recordLabel: String?,
 			   override val imported: Boolean,
 			   override val basePrice: Double,
 			   override var taxes: Taxes? = null): Music
\ No newline at end of file

lm-challenge-lib/src/main/kotlin/com/lm/sales/model/music/Music.kt

@@ -4,8 +4,8 @@ import com.lm.sales.model.Product
 
 interface Music: Product {
 
-    val mainArtist: String
+    val mainArtist: String?
     val tracks: Int?
-    val recordLabel: String
+    val recordLabel: String?
     // ...
 }
\ No newline at end of file

lm-challenge-lib/src/main/kotlin/com/lm/sales/model/stationery/Book.kt

@@ -8,7 +8,7 @@ import com.lm.sales.model.Taxes
  * @author j.hernandez
  */
 data class Book (override val name: String,
-                 val author: String,
+                 val author: String?,
                  override val imported: Boolean,
                  override val pages: Int?,
                  override val editorial: String?,