Better error handling

app/src/main/java/net/pokeranalytics/android/ui/view/RowRepresentable.kt

@@ -1,6 +1,7 @@
 package net.pokeranalytics.android.ui.view
 
 import android.content.Context
+import net.pokeranalytics.android.exceptions.PAIllegalStateException
 import net.pokeranalytics.android.model.LiveData
 import net.pokeranalytics.android.ui.fragment.components.bottomsheet.BottomSheetType
 import net.pokeranalytics.android.util.NULL_TEXT
@@ -57,7 +58,7 @@ interface Displayable : Localizable {
 	 */
 	val viewType: Int
 		get() {
-			return -1
+			throw PAIllegalStateException("The Displayable instance $this must return a valid viewType")
 		}
 
 	val relatedResultsRepresentable: LiveData?