Fixes crash when rate is null

app/src/main/java/net/pokeranalytics/android/ui/fragment/BankrollDataFragment.kt

@@ -117,12 +117,9 @@ class BankrollDataFragment : EditableDataFragment(), StaticRowRepresentableDataS
 		return when (row) {
 			SimpleRow.NAME -> row.editingDescriptors(mapOf("defaultValue" to this.bankroll.name))
 			BankrollRow.RATE -> {
-
-				this.bankroll.currency?.rate?.let { rate ->
-					row.editingDescriptors(mapOf("defaultValue" to CurrencyUtils.getCurrencyRateFormatter().format(rate)))
-				} ?: run {
-					row.editingDescriptors(mapOf())
-				}
+				val rate = this.bankroll.currency?.rate ?: 1.0
+				val rateFormatted = CurrencyUtils.getCurrencyRateFormatter().format(rate)
+				row.editingDescriptors(mapOf("defaultValue" to rateFormatted))
 			}
 			else -> null
 		}