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The documentation of the graphics_array() fonction is not very explicit, but the documentation of the GraphicsArray class states: "GraphicsArray takes a (m x n) list of lists of graphics objects and plots them all on one canvas." Hence, each row must have the same number of Graphics objects.

In your case, a possible workaround could be to add empty graphics in the array:

sage: empty = Graphics()    
sage: empty.axes(False)
sage: graphics_array([[p0,empty],[p1, p2]])