cb116b42f46fc11c60d1976c190eb1d9570da48a

When camera is the pivot of 3d window, and you go to camera view, moving out of view with MMB drag causes zooming to stop working. Zooms depend on view3d "dist" value, which then became zero. This fix just makes dist "1.0" then, arbitrary but keeps things at least work. (Tried restoring to previous 'dist', but this fails in cases too)
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