Removed batch2d empty draw calls

src/graphics/Batch2D.cpp

@@ -304,6 +304,8 @@ void Batch2D::sprite(float x, float y, float w, float h, int atlasRes, int index
 }
 
 void Batch2D::render(unsigned int gl_primitive) {
+    if (index == 0)
+        return;
     mesh->reload(buffer, index / B2D_VERTEX_SIZE);
     mesh->draw(gl_primitive);
     index = 0;