bad value exception in sumValue with pieChart

[g-regoz]

Describe the bug
within a pieChart, when using:
pieTouchData: PieTouchData(
touchCallback: (FlTouchEvent event, pieTouchResponse) {
precursorCtl.checkTouchedIndex(event, pieTouchResponse);
},
If the pie section data/value are null/don't exist, it will throw an exception complaining about bad values.

replaced existing sumValue() in pie_chart_data.dart with this (very cautious) code, and seems to now work:
double get sumValue {
// Map the values
var values = sections.map((data) => data.value).toList();

// Print out the values to help with debugging
// print("Mapped values: $values");

// Handle case when list is empty or all values are null
if (values.isEmpty || values.every((v) => v == null)) {
  // print("No valid values to sum, returning 0.0");
  return 0.0;
}

// Filter out any null values just in case
var nonNullValues = values.where((value) => value != null).toList();

// Print non-null values to help debugging
// print("Non-null values: $nonNullValues");

// Check again for empty list after filtering out nulls
if (nonNullValues.isEmpty) {
  // print("No non-null values, returning 0.0");
  return 0.0;
}

// Safely sum the values using fold instead of reduce
return nonNullValues.fold(0.0, (sum, value) => sum + value!);

}

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Versions

• Flutter 3.19.6
• flCharts version 0.67