Return an error when loading non-existent labels #9751
                
     Merged
            
            
          
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Objective
Calling
asset_server.load("scene.gltf#SomeLabel")will silently fail ifSomeLabeldoes not exist.Referenced in #9714
Solution
We now detect this case and return an error. I also slightly refactored
load_internalto make the logic / dataflow much clearer.