cc01bb83f6
This affected sculpt, vertex- and weightpaint. So attempting to (temporarily) switching to the smooth/blur tools from another tool using the "Shift" shortcut can fail if the corresponding smooth/blur brush is not found/missing [which was the case in the report because the brush was deleted]. In this case, brushes dont really get switched, but blender would still try to cache the size (because the smooth/blur brush temporarily uses the same size as the previous brush) of the smooth brush in `StrokeCache` (see `smooth_brush_toggle_on`). Then in `smooth_brush_toggle_off` it was assumed brushes were actually switched and the (non-existing) size of the (missing) smooth brush was applied to the **actual** brush. Now restructure code a bit so in the case of a missing brush we can early out (without affecting the **actual** brush then). Pull Request: https://projects.blender.org/blender/blender/pulls/111516
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