Skip emitting empty nodes for entity meshes

src/mcedit2/rendering/chunkmeshes/entitymesh.py

@@ -235,6 +235,9 @@ class TileEntityLocationMesh(EntityMeshBase):
                 continue
             tilePositions.append(ref.Position)
 
+        if not len(tilePositions):
+            return
+
         tiles = self._computeVertices(tilePositions, defaultColor, chunkPosition=chunk.chunkPosition)
 
         vertexNode = VertexNode([tiles])
@@ -279,6 +282,9 @@ class CommandBlockLocationMesh(EntityMeshBase):
             else:
                 continue
 
+        if not len(tileColors):
+            return
+
         tiles = self._computeVertices(tilePositions, tileColors, chunkPosition=chunk.chunkPosition)
 
         vertexNode = VertexNode([tiles])
@@ -354,6 +360,9 @@ class ItemFrameMesh(EntityMeshBase):
             # xxxx assumes 1.8 TilePos - fix this in ref??
             mapTiles.append((mapTex, ref.TilePos, ref.Facing))
 
+        if not len(mapTiles):
+            return
+
         nodes = []
 
         for mapTex, (x, y, z), facing in mapTiles:
@@ -440,6 +449,9 @@ class MonsterModelRenderer(ChunkMeshBase):
 
             yield
 
+        if not sceneNode.childCount():
+            return
+
         self.sceneNode = sceneNode
 
 
@@ -554,6 +566,9 @@ class MonsterLocationRenderer(EntityMeshBase):
                 continue
             monsterPositions.append(pos)
 
+        if not len(monsterPositions):
+            return
+
         monsters = self._computeVertices(monsterPositions,
                                          (0xff, 0x22, 0x22, 0x44),
                                          offset=True,