Throws exception if the currency code is wrong when setting it

app/src/main/java/net/pokeranalytics/android/model/realm/Currency.kt

@@ -3,6 +3,7 @@ package net.pokeranalytics.android.model.realm
 import io.realm.RealmObject
 import io.realm.annotations.Ignore
 import io.realm.annotations.PrimaryKey
+import net.pokeranalytics.android.exceptions.PAIllegalStateException
 import net.pokeranalytics.android.util.UserDefaults
 import java.util.*
 
@@ -22,6 +23,17 @@ open class Currency : RealmObject() {
 	 * The currency code of the currency, i.e. USD, EUR...
  	 */
     var code: String? = null
+		set(value) {
+			try {
+				if (value != null) {
+					java.util.Currency.getInstance(value) // test validity of code
+				}
+				field = value
+			} catch (e: Exception) {
+				// make app crash earlier than later, possibly to show an error message to the user in the future
+				throw PAIllegalStateException(e.localizedMessage)
+			}
+		}
 
 	/**
 	 * The rate of the currency with the main currency