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UnrealEngineUWP/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponentsEditorOnly
nathan mitchell d817f21d71 Modeling Tools: Provide support for the IMeshDescriptionProvider to provide "empty" MeshDescriptions, for cases where such instances are desired such as changing topology. This change creates extendable infrastructure parallel to the existing MeshDescription provider implementations so clients of the empty MeshDescription instances do not need localized specialization based on ToolTarget subclasses.
This change addresses the errors found with applying certain modeling tools to skeletal meshes due to the old code not using the appropriately setup MeshDescription for skeletal meshes.

#rb Ryan.Schmidt
#rnx
#jira UE-138420
#preflight 61d8dbc4430de36baa5fd904

#ROBOMERGE-AUTHOR: nathan.mitchell
#ROBOMERGE-SOURCE: CL 18588220 in //UE5/Release-5.0/... via CL 18588227 via CL 18588243
#ROBOMERGE-BOT: STARSHIP (Release-Engine-Test -> Main) (v899-18417669)

[CL 18588249 by nathan mitchell in ue5-main branch]
2022-01-12 14:53:07 -05:00
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