Reproduction steps:
- Create a bar chart
- Select some source data
- Group the chart on a field with "None" values
Trace:
Caught exception: Try to access to an unknown key :
#0 /usr/share/tuleap/plugins/graphontrackersv5/include/graphic-library/BarChartDataBuilder.php(100): Tuleap\GraphOnTrackersV5\GraphicLibrary\BarChartDataBuilder->getXaxisKeyFromLabel()
#1 /usr/share/tuleap/plugins/graphontrackersv5/include/graphic-library/BarChartDataBuilder.php(33): Tuleap\GraphOnTrackersV5\GraphicLibrary\BarChartDataBuilder->buildGroupByFieldValues()
#2 /usr/share/tuleap/plugins/graphontrackersv5/include/graphic-library/GraphOnTrackersV5_Engine_Bar.class.php(175): Tuleap\GraphOnTrackersV5\GraphicLibrary\BarChartDataBuilder->buildGroupedBarChartData()
#3 /usr/share/tuleap/plugins/graphontrackersv5/include/graphic-library/GraphOnTrackersV5_Engine_Bar.class.php(163): GraphOnTrackersV5_Engine_Bar->getGroupedBarChartData()
#4 /usr/share/tuleap/plugins/graphontrackersv5/include/graphic-library/GraphOnTrackersV5_Engine_Bar.class.php(154): GraphOnTrackersV5_Engine_Bar->getChartData()
#5 /usr/share/tuleap/plugins/graphontrackersv5/include/data-access/GraphOnTrackersV5_Chart.class.php(370): GraphOnTrackersV5_Engine_Bar->toArray()
#6 /usr/share/tuleap/plugins/graphontrackersv5/include/Async/ChartDataController.php(99): GraphOnTrackersV5_Chart->fetchAsArray()
#7 /usr/share/tuleap/src/common/Http/Server/RequestHandlerAsMiddleware.php(44): Tuleap\GraphOnTrackersV5\Async\ChartDataController->handle()
#8 /usr/share/tuleap/src/common/Http/Server/MiddlewareDispatcher.php(52): Tuleap\Http\Server\RequestHandlerAsMiddleware->process()
#9 /usr/share/tuleap/src/common/Http/Server/SessionWriteCloseMiddleware.php(36): Tuleap\Http\Server\MiddlewareDispatcher->handle()
#10 /usr/share/tuleap/src/common/Http/Server/MiddlewareDispatcher.php(52): Tuleap\Http\Server\SessionWriteCloseMiddleware->process()
#11 /usr/share/tuleap/src/common/Request/DispatchablePSR15Compatible.php(62): Tuleap\Http\Server\MiddlewareDispatcher->handle()
#12 /usr/share/tuleap/src/common/Request/FrontRouter.php(248): Tuleap\Request\DispatchablePSR15Compatible->process()
#13 /usr/share/tuleap/src/common/Request/FrontRouter.php(108): Tuleap\Request\FrontRouter->routeHandler()
#14 /usr/share/tuleap/src/www/index.php(49): Tuleap\Request\FrontRouter->route()
#15 {main}