Hi,

using an empty mathtext "$$" in labels generates an exception. See 
example and traceback below.

/Jörgen

from pylab import *
from numpy import *

x=arange(0,2*pi,0.1)
plot(x,sin(x))
title(r"$$")
show()



Exception in Tkinter callback
Traceback (most recent call last):
   File "C:\python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
     return self.func(*args)
   File 
"c:\python\external\matplotlib-trunk\build\lib.win32-2.5\matplotlib\backends\backend_tkagg.py",
 
line 188, in resize
     self.show()
   File 
"c:\python\external\matplotlib-trunk\build\lib.win32-2.5\matplotlib\backends\backend_tkagg.py",
 
line 191, in draw
     FigureCanvasAgg.draw(self)
   File 
"c:\python\external\matplotlib-trunk\build\lib.win32-2.5\matplotlib\backends\backend_agg.py",
 
line 255, in draw
     self.figure.draw(self.renderer)
   File 
"c:\python\external\matplotlib-trunk\build\lib.win32-2.5\matplotlib\figure.py", 
line 796, in draw
     for a in self.axes: a.draw(renderer)
   File 
"c:\python\external\matplotlib-trunk\build\lib.win32-2.5\matplotlib\axes.py", 
line 1494, in draw
     a.draw(renderer)
   File 
"c:\python\external\matplotlib-trunk\build\lib.win32-2.5\matplotlib\text.py", 
line 295, in draw
     bbox, info = self._get_layout(renderer)
   File 
"c:\python\external\matplotlib-trunk\build\lib.win32-2.5\matplotlib\text.py", 
line 195, in _get_layout
     line, self._fontproperties, ismath=self.is_math_text(line))
   File 
"c:\python\external\matplotlib-trunk\build\lib.win32-2.5\matplotlib\backends\backend_agg.py",
 
line 134, in get_text_width_height_descent
     self.mathtext_parser.parse(s, self.dpi, prop)
   File 
"c:\python\external\matplotlib-trunk\build\lib.win32-2.5\matplotlib\mathtext.py",
 
line 2706, in parse
     box = self._parser.parse(s, font_output, fontsize, dpi)
   File 
"c:\python\external\matplotlib-trunk\build\lib.win32-2.5\matplotlib\mathtext.py",
 
line 2186, in parse
     str(err)]))
ValueError:
$$
^
Expected end of text (at char 0), (line:1, col:1)

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