Some touches cause crash on android

[vincent-schirmann]

We noticed a lot of crashes in the TouchProcessor.
I can't reproduce it very often. Sometimes when I touch a lot, or when I slide the android status bar...
Here's the trace

08-20 13:46:27.651 24475 25974 E HXCPP   : Called from hxcpp::__hxcpp_main
08-20 13:46:27.651 24475 25974 E HXCPP   : Called from ApplicationMain::main ApplicationMain.hx line 25
08-20 13:46:27.651 24475 25974 E HXCPP   : Called from ApplicationMain::create ApplicationMain.hx line 130
08-20 13:46:27.651 24475 25974 E HXCPP   : Called from lime.app.Application::exec lime/app/Application.hx line 150
08-20 13:46:27.651 24475 25974 E HXCPP   : Called from lime._internal.backend.native.NativeApplication::exec lime/_internal/backend/native/NativeApplication.hx line 146
08-20 13:46:27.651 24475 25974 E HXCPP   : Called from lime._internal.backend.native.NativeApplication::handleRenderEvent lime/_internal/backend/native/NativeApplication.hx line 370
08-20 13:46:27.651 24475 25974 E HXCPP   : Called from lime.app._Event_lime_graphics_RenderContext_Void::dispatch lime/_internal/macros/EventMacro.hx line 91
08-20 13:46:27.651 24475 25974 E HXCPP   : Called from openfl.display.Stage::__onLimeRender openfl/display/Stage.hx line 1950
08-20 13:46:27.651 24475 25974 E HXCPP   : Called from openfl.display.Stage::__broadcastEvent openfl/display/Stage.hx line 1166
08-20 13:46:27.651 24475 25974 E HXCPP   : Called from openfl.display.DisplayObject::__dispatch openfl/display/DisplayObject.hx line 1399
08-20 13:46:27.651 24475 25974 E HXCPP   : Called from openfl.events.EventDispatcher::__dispatchEvent openfl/events/EventDispatcher.hx line 402
08-20 13:46:27.651 24475 25974 E HXCPP   : Called from starling.core.Starling::onEnterFrame starling/core/Starling.hx line 700
08-20 13:46:27.651 24475 25974 E HXCPP   : Called from starling.core.Starling::nextFrame starling/core/Starling.hx line 469
08-20 13:46:27.651 24475 25974 E HXCPP   : Called from starling.core.Starling::advanceTime starling/core/Starling.hx line 482
08-20 13:46:27.651 24475 25974 E HXCPP   : Called from starling.events.TouchProcessor::advanceTime starling/events/TouchProcessor.hx line 201
08-20 13:46:27.651 24475 25974 E HXCPP   : Called from starling.events.TouchProcessor::processTouches starling/events/TouchProcessor.hx line 273
08-20 13:46:27.651 24475 25974 E Exception: Null Object Reference

Anyway, I found it to be relative to openfl bug : openfl/openfl#2495

Until the bug is fixed, the workaround could be either use Array instead of Vector, or protect the Std.isOfType(touchData, Touch) && cast(Reflect.field(touchData, "touch"), Touch) by a isOfType test.