[GEN][ZH] Fix World Builder crashing on drawing scene, introduced by previous change #1146 (#1184)

Author: xezon

Generals/Code/GameEngineDevice/Source/W3DDevice/GameClient/W3DScene.cpp

@@ -399,7 +399,7 @@ void RTS3DScene::Visibility_Check(CameraClass * camera)
 	m_translucentObjectsCount=0;
 	m_numNonOccluderOrOccludee=0;
 
-	Int currentFrame=TheGameLogic->getFrame();
+	Int currentFrame = TheGameLogic ? TheGameLogic->getFrame() : 0;
 	if (currentFrame <= TheGlobalData->m_defaultOcclusionDelay)
 		currentFrame = TheGlobalData->m_defaultOcclusionDelay+1;	//make sure occlusion is enabled when game starts (frame 0).
 
@@ -471,7 +471,7 @@ void RTS3DScene::Visibility_Check(CameraClass * camera)
 							m_translucentObjectsBuffer[m_translucentObjectsCount++] = robj;
 						}
 						else
-						if (TheGlobalData->m_enableBehindBuildingMarkers && TheGameLogic->getShowBehindBuildingMarkers())
+						if (TheGlobalData->m_enableBehindBuildingMarkers && TheGameLogic && TheGameLogic->getShowBehindBuildingMarkers())
 						{
 							//visible drawable. Check if it's either an occluder or occludee
 							if (draw->isKindOf(KINDOF_STRUCTURE) && m_numPotentialOccluders < TheGlobalData->m_maxVisibleOccluderObjects)

GeneralsMD/Code/GameEngineDevice/Source/W3DDevice/GameClient/W3DScene.cpp

@@ -415,7 +415,7 @@ void RTS3DScene::Visibility_Check(CameraClass * camera)
 	m_translucentObjectsCount=0;
 	m_numNonOccluderOrOccludee=0;
 
-	Int currentFrame=TheGameLogic->getFrame();
+	Int currentFrame = TheGameLogic ? TheGameLogic->getFrame() : 0;
 	if (currentFrame <= TheGlobalData->m_defaultOcclusionDelay)
 		currentFrame = TheGlobalData->m_defaultOcclusionDelay+1;	//make sure occlusion is enabled when game starts (frame 0).
 
@@ -490,7 +490,7 @@ void RTS3DScene::Visibility_Check(CameraClass * camera)
 						{	drawInfo->m_flags |= DrawableInfo::ERF_IS_TRANSLUCENT;	//object is translucent
 							m_translucentObjectsBuffer[m_translucentObjectsCount++] = robj;
 						}
-						if (TheGlobalData->m_enableBehindBuildingMarkers && TheGameLogic->getShowBehindBuildingMarkers())
+						if (TheGlobalData->m_enableBehindBuildingMarkers && TheGameLogic && TheGameLogic->getShowBehindBuildingMarkers())
 						{
 							//visible drawable. Check if it's either an occluder or occludee
 							if (draw->isKindOf(KINDOF_STRUCTURE) && m_numPotentialOccluders < TheGlobalData->m_maxVisibleOccluderObjects)