3DS, COB, SMD: Empty mChildren should be null

Leave as null when no children

code/AssetLib/3DS/3DSConverter.cpp

@@ -643,11 +643,17 @@ void Discreet3DSImporter::AddNodeToGraph(aiScene *pcSOut, aiNode *pcOut,
     }
 
     // Allocate storage for children
-    pcOut->mNumChildren = (unsigned int)pcIn->mChildren.size();
+    const unsigned int size = static_cast<unsigned int>(pcIn->mChildren.size());
+
+    pcOut->mNumChildren = size;
+    if (size == 0) {
+        return;
+    }
+
     pcOut->mChildren = new aiNode *[pcIn->mChildren.size()];
 
     // Recursively process all children
-    const unsigned int size = static_cast<unsigned int>(pcIn->mChildren.size());
+    
     for (unsigned int i = 0; i < size; ++i) {
         pcOut->mChildren[i] = new aiNode();
         pcOut->mChildren[i]->mParent = pcOut;

code/AssetLib/COB/COBLoader.cpp

@@ -372,9 +372,11 @@ aiNode *COBImporter::BuildNodes(const Node &root, const Scene &scin, aiScene *fi
     }
 
     // add children recursively
-    nd->mChildren = new aiNode *[root.temp_children.size()]();
-    for (const Node *n : root.temp_children) {
-        (nd->mChildren[nd->mNumChildren++] = BuildNodes(*n, scin, fill))->mParent = nd;
+    if (!root.temp_children.empty()) {
+        nd->mChildren = new aiNode *[root.temp_children.size()]();
+        for (const Node *n : root.temp_children) {
+            (nd->mChildren[nd->mNumChildren++] = BuildNodes(*n, scin, fill))->mParent = nd;
+        }
     }
 
     return nd;

code/AssetLib/SMD/SMDLoader.cpp

@@ -400,8 +400,12 @@ void SMDImporter::AddBoneChildren(aiNode* pcNode, uint32_t iParent) {
         }
     }
 
+    // nothing to do
+    if (pcNode->mNumChildren == 0)
+        return;
+
     // now allocate the output array
-    pcNode->mChildren = new aiNode*[pcNode->mNumChildren];
+    pcNode->mChildren = new aiNode *[pcNode->mNumChildren];
 
     // and fill all subnodes
     unsigned int qq( 0 );