fix gizmo drawing issue happens due to a null world object

Source/SenseGlove/Private/SenseGlove/Components/SGWristTrackerComponent.cpp

@@ -746,6 +746,7 @@ void USGWristTrackerComponent::FImpl::UpdateWristTrackingData() const
 
 void USGWristTrackerComponent::FImpl::DrawDebugGizmo()
 {
+    const UWorld* World{Owner->GetWorld()};
     const FVector& Location{Owner->GetComponentLocation()};
     const FRotator& Rotation{Owner->GetComponentRotation()};
     const float Length = Owner->GetDebugWristTrackerGizmoLength();
@@ -757,8 +758,9 @@ void USGWristTrackerComponent::FImpl::DrawDebugGizmo()
     const FColor& YAxisColor{Owner->GetDebugWristTrackerGizmoYAxisColor()};
     const FColor& ZAxisColor{Owner->GetDebugWristTrackerGizmoZAxisColor()};
 
-    FSGDebugGizmo::Draw(Location, Rotation, Length, Thickness, XAxisColor, YAxisColor, ZAxisColor,
-        bPersistentLines, LifeTimeModifier, DepthPriority);
+    FSGDebugGizmo::Draw(World, Location, Rotation, Length, Thickness,
+                        XAxisColor, YAxisColor, ZAxisColor,
+                        bPersistentLines, LifeTimeModifier, DepthPriority);
 }
 
 void USGWristTrackerComponent::FImplDeleter::operator()(const FImpl* P) const

Source/SenseGloveDebug/Private/SGDebug/SGDebugGizmo.cpp

@@ -36,24 +36,20 @@
 #include "SGDebug/SGDebugGizmo.h"
 
 #include "DrawDebugHelpers.h"
-#include "Engine/Engine.h"
 #include "Kismet/GameplayStatics.h"
 #include "Math/Color.h"
 #include "Math/Rotator.h"
 #include "Math/Vector.h"
 
+#include "SGLog/SGLog.h"
+
 void FSGDebugGizmo::Draw(
+    const UWorld* World,
     const FVector& Location, const FRotator& Rotation,
     const float Length, const float Thickness,
     const FColor& XAxisColor, const FColor& YAxisColor, const FColor& ZAxisColor,
     const bool bPersistentLines, const float LifeTimeModifier, const uint8 DepthPriority)
 {
-    if (!GEngine)
-    {
-        return;
-    }
-
-    const UWorld* World{GEngine->GetWorld()};
     const float LifeTime = UGameplayStatics::GetWorldDeltaSeconds(World) * LifeTimeModifier;
 
     const FVector XAxisLineEnd(Location + Rotation.RotateVector(FVector(Length, 0.0f, 0.0f)));

Source/SenseGloveDebug/Public/SGDebug/SGDebugGizmo.h

@@ -39,6 +39,7 @@ class SENSEGLOVEDEBUG_API FSGDebugGizmo final
 {
 public:
     static void Draw(
+        const UWorld* World,
         const FVector& Location, const FRotator& Rotation,
         float Length = 1.0f,
         float Thickness = 1.0f,