[bug #2549] (thuban) exception when trying to generate one class

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this bug's URL: http://intevation.de/rt/webrt?serial_num=2549
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Subject: exception when trying to generate one class 

Operating System: GNU/Linux, Debian GNU/Linux Sarge
Thuban version: CVS 
wxPython version: 2.4.2.4
Python version: 2.3.4
PySQLite version: 0.4.3
SQLite version: 2.8.13
GDAL version: 1.2.0
proj version: 4.4.7

the following exception occured when i try to generade classification from 
"Quantiles from Table" with only one class:

Traceback (most recent call last):
  File "/big/home/janschu/project/thuban/Thuban/UI/classgen.py", line 269, in OnOK
    adjusted, self.clazz = \
  File "/big/home/janschu/project/thuban/Thuban/Model/classgen.py", line 114, in generate_quantiles
    quantiles = calculate_quantiles(_list, percents, _range)
  File "/big/home/janschu/project/thuban/Thuban/Model/classgen.py", line 192, in calculate_quantiles
    raise ValueError("percents parameter must have more than one item")
ValueError: percents parameter must have more than one item


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