VIRO-2899: keyframe animations on meshless nodes

Keyframe animations were only being exported for
nodes that had meshes. This was causing animation
issues, most notably with the dragon FBX model, where
the ball was not animating.

Author: radvani

ViroFBX/VROFBXExporter.cpp

@@ -277,12 +277,14 @@ void VROFBXExporter::exportNode(FbxScene *scene, FbxNode *node, int depth, bool
             pinfo("   No skeleton found, will not export skin");
         }
 
-        pinfo("   Exporting keyframe animations");
-        exportSampledKeyframeAnimations(scene, node, outNode);
-        
         pinfo("   Exporting blend shape animations");
         exportBlendShapeAnimations(scene, node, outNode);
     }
+    
+    // Keyframe animations can be contained in mesh-less nodes
+    pinfo("   Exporting keyframe animations");
+    exportSampledKeyframeAnimations(scene, node, outNode);
+    
     for (int i = 0; i < node->GetChildCount(); i++) {
         if (isExportableNode(node->GetChild(i))) {
             exportNode(scene, node->GetChild(i), depth, compressTextures,