Selection 当图表未加载数据时 报错

[lwp001]

在图表设置 hover 显示 tooltip时 当图表数据为空时 报错：

[ERROR:flutter/shell/common/shell.cc(93)] Dart Unhandled Exception: RangeError (index): Invalid value: Valid value range is empty: -1, stack trace: #0 List.[] (dart:core-patch/growable_array.dart:264:36)
#1 PointSelector.select (package:graphic/src/interaction/selection/point.dart:135:27)
#2 SelectOp.evaluate (package:graphic/src/interaction/selection/selection.dart:336:40)
#3 Operator.run (package:graphic/src/dataflow/operator.dart:95:29)
#4 Dataflow.evaluate (package:graphic/src/dataflow/dataflow.dart:94:27)
#5 View.evaluate (package:graphic/src/chart/view.dart:78:17)
#6 Dataflow.run (package:graphic/src/dataflow/dataflow.dart:122:16)
#7 Dataflow.bindChannel. (package:graphic/src/dataflow/dataflow.dart:154:7)
#8 _rootRunUnary (dart:async/zone.dart:1442:13)
#9 _RootZone.runUnaryGuarded (dart:async/zone.dart:1621:7)
#10 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341:11)
#11 _DelayedData.perform (dart:async/stream_impl.dart:591:14)
#12 _StreamImplEvents.handleNext (dart:async/stream_impl.dart:706:11)
#13 _PendingEvents.schedule. (dart:async/stream_impl.dart:663:7)
#14 _rootRun (dart:async/zone.dart:1418:47)
#15 _CustomZone.run (dart:async/zone.dart:1328:19)
#16 _CustomZone.runGuarded (dart:async/zone.dart:1236:7)
#17 _CustomZone.bindCallbackGuarded. (dart:async/zone.dart:1276:23)
#18 _rootRun (dart:async/zone.dart:1426:13)
#19 _CustomZone.run (dart:async/zone.dart:1328:19)
#20 _CustomZone.runGuarded (dart:async/zone.dart:1236:7)
#21 _CustomZone.bindCallbackGuarded. (dart:async/zone.dart:1276:23)
#22 _microtaskLoop (dart:async/schedule_microtask.dart:40:21)
#23 _startMicrotaskLoop (dart:async/schedule_microtask.dart:49:5)

是否可以在数据为空时 不触发 selections 动作

[entronad]

不要让图表的数据为空，会发生很多未知问题