Better error for crash

app/src/main/java/net/pokeranalytics/android/ui/modules/handhistory/model/EditorViewModel.kt

@@ -113,9 +113,11 @@ class EditorViewModel : ViewModel(), RowRepresentableDataSource, CardCentralizer
 	 */
 	val currentKeyboard: HHKeyboard?
 		get() {
-			this.selectionLiveData.value?.let {
+			this.selectionLiveData.value?.let { selection ->
-				val row = this.rowRepresentables[it.index] as HandHistoryRow
+				val row = this.rowRepresentables[selection.index]
-				return row.keyboardForTag(it.tag)
+				(row as? HandHistoryRow)?.let { hhRow ->
+					return hhRow.keyboardForTag(selection.tag)
+				} ?: throw PAIllegalStateException("Row $row cannot be cast to HandHistoryRow")
 			}
 			return null
 		}
@@ -695,11 +697,11 @@ class EditorViewModel : ViewModel(), RowRepresentableDataSource, CardCentralizer
 
 	// Row Representable Datasource
 
-	override fun adapterRows(): List<RowRepresentable>? {
+	override fun adapterRows(): List<RowRepresentable> {
 		return this.rowRepresentables
 	}
 
-	override fun rowRepresentableForPosition(position: Int): RowRepresentable? {
+	override fun rowRepresentableForPosition(position: Int): RowRepresentable {
 		return this.rowRepresentables[position]
 	}
 
@@ -859,7 +861,7 @@ class EditorViewModel : ViewModel(), RowRepresentableDataSource, CardCentralizer
 		}
 	}
 
-	override fun backgroundColor(position: Int, row: RowRepresentable): Int? {
+	override fun backgroundColor(position: Int, row: RowRepresentable): Int {
 		return if (this.isEdited) {
 			if (position < this.settingsRowCount) R.color.green_header else R.color.transparent
 		} else {