Fixes crash when setting empty value on net result

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

@@ -759,7 +759,13 @@ open class Session : RealmObject(), Savable, Editable, StaticRowRepresentableDat
 				}
 				SessionRow.BUY_IN -> {
 					val localResult = if (this.result != null) this.result as Result else realm.createObject(Result::class.java)
-					localResult.buyin = value as Double?
+
+					if (value == null) {
+						localResult.buyin = null
+					} else {
+						localResult.buyin = (value as String).toDouble()
+					}
+
 					this.result = localResult
 					this.updateRowRepresentation()
 				}
@@ -776,7 +782,13 @@ open class Session : RealmObject(), Savable, Editable, StaticRowRepresentableDat
 				}
 				SessionRow.NET_RESULT -> {
 					this.result?.let { result ->
-						result.netResult = (value as String).toDouble()
+
+						if (value == null) {
+							result.netResult = null
+						} else {
+							result.netResult = (value as String).toDouble()
+						}
+
 					}
 				}
 				SessionRow.COMMENT -> comment = value as String? ?: ""
@@ -819,7 +831,12 @@ open class Session : RealmObject(), Savable, Editable, StaticRowRepresentableDat
 				SessionRow.TABLE_SIZE -> tableSize = value as Int?
 				SessionRow.TIPS -> {
 					val localResult = if (result != null) result as Result else realm.createObject(Result::class.java)
-					localResult.tips = value as Double?
+					if (value == null) {
+						localResult.tips = null
+					} else {
+						localResult.tips = (value as String).toDouble()
+					}
+
 					result = localResult
 				}
 				SessionRow.TOURNAMENT_NAME -> tournamentName = value as TournamentName?