MDC-Loader: fix a possible nullptr access.

CMakeLists.txt

@@ -111,9 +111,9 @@ OPTION( INJECT_DEBUG_POSTFIX
 )
 
 IF (IOS)
-	IF (NOT CMAKE_BUILD_TYPE)
- 		SET(CMAKE_BUILD_TYPE "Release")
-	ENDIF (NOT CMAKE_BUILD_TYPE)
+  IF (NOT CMAKE_BUILD_TYPE)
+    SET(CMAKE_BUILD_TYPE "Release")
+  ENDIF (NOT CMAKE_BUILD_TYPE)
 ENDIF (IOS)
 
 # Use subset of Windows.h

code/MDCLoader.cpp

@@ -434,10 +434,12 @@ void MDCImporter::InternReadFile(
     else if (1 == pScene->mNumMeshes)
     {
         pScene->mRootNode = new aiNode();
-        pScene->mRootNode->mName = pScene->mMeshes[0]->mName;
-        pScene->mRootNode->mNumMeshes = 1;
-        pScene->mRootNode->mMeshes = new unsigned int[1];
-        pScene->mRootNode->mMeshes[0] = 0;
+        if ( nullptr != pScene->mMeshes[0] ) {
+            pScene->mRootNode->mName = pScene->mMeshes[0]->mName;
+            pScene->mRootNode->mNumMeshes = 1;
+            pScene->mRootNode->mMeshes = new unsigned int[1];
+            pScene->mRootNode->mMeshes[0] = 0;
+        }
     }
     else
     {