another table crash

[John Levon]

this is reproducable easily, but not automatically.

1) create a 5x5 table

2) set two cells to be multicolumn

3) whilst continuously typing text, use the mouse to select
between the multicolumn cell and the two cells below. eventually
you'll get a crash :

#7  0x811f5bd in _ZNK7LyXText9SetCursorEP10BufferViewR9LyXCursorP12LyXParagraphib 
(this=0x84b3a10, bview=0x848c4d0, cur=@0x84b3aa4,
    par=0x84bc090, pos=1, boundary=false) at text2.C:2062
    2062            y += row->baseline();
(gdb) print row
$1 = (class Row *) 0x0                                                                 
                                                            

thanks
john

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