qlog crash on mysql branch: unsupported operand type(s) for *: 'float' and 'NoneType'

[Gary van der Merwe]

Regression in rev 1317

Steps to reproduce:
bzr branch lp:mysql-server -r 3199
bzr qlog
expand 3199, 3181.1.20, 2875.104.11, 3181.1.19

bzr: ERROR: exceptions.TypeError: unsupported operand type(s) for *: 'float' and 'NoneType'

Traceback (most recent call last):
  File "/home/garyvdm/.bazaar/plugins/qbzr/lib/logwidget.py", line 650, in paint
    start, end, color, direct)
  File "/home/garyvdm/.bazaar/plugins/qbzr/lib/logwidget.py", line 760, in drawLine
    endx = round(rect.x() + boxsize * end + boxsize / 2)
TypeError: unsupported operand type(s) for *: 'float' and 'NoneType'