Edit detail for #433 viewport manager does not restart revision 1 of 3

changed:
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If somebody could fix this quickly, (s)he'd make me very happy:

In a fresh session:

\begin{verbatim}
o := point [0,0]
v1 := point [1,0.5]
g := makeGraphImage ([[o, v1]], [red()],  [blue()], [6])$GRIMAGE
makeViewport2D(g, [])$VIEW2D
\end{verbatim}

close the graphics window, then

\begin{verbatim}
makeViewport2D(g, [])$VIEW2D
\end{verbatim}

I get:

  FriCAS2D data being transmitted to the viewport manager...
  The viewport manager cannot find the requested graph and will quit and restart.

But nothing happens...