[bugfix] fix RangeError when _sortedElements is empty #164
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when _sortedElements is empty throw RangeError.
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when _sortedElements is empty throw RangeError.
The following RangeError was thrown during a scheduler callback:
RangeError (index): Invalid value: Valid value range is empty: 0
When the exception was thrown, this was the stack:
#0 List.[] (dart:core-patch/growable_array.dart:264:36)
#1 _GroupedListViewState._scrollListener (package:grouped_list/grouped_list.dart:366:48)
#2 _GroupedListViewState.build. (package:grouped_list/grouped_list.dart:272:9)
#3 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1175:15)
#4 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1113:9)
#5 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1015:5)
#6 _invoke (dart:ui/hooks.dart:148:13)
#7 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:318:5)