Safeguards the generation of explosion trail lines to avoid creating
invalid geometry.
Previously, if a part displacement was zero (or effectively zero),
`Part.LineSegment` would attempt to create a line with identical start
and end points, causing OpenCascade to throw a `Part.OCCError`. This
resulted in failures during document restoration and recomputes.
This commit introduces a `_createSafeLine` helper method that checks the
distance against a `1e-7` (near-zero) tolerance before attempting to
generate the shape.
* Assembly: Sub-assembly: fix support for Part-wb objects
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* Assembly: no dragger for connected parts
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* [ Assembly ]: Update SPDX License Identifiers
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* Assembly: ExplodedViews: Add getExplodedShape for techdraw to use
* TechDraw: ShapeExtractor fix assembly exploded views
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* Assembly: Fix variable casing in CommandCreateView.py
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* Assembly: Fix Iisolate issue when obj and link both in assembly
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* Update src/Mod/Assembly/Gui/ViewProviderAssembly.cpp
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This is defensive code that protects against attempting to dereference
nodes that are not present, preventing the python code from throwing an
AttributeError.
