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Description of problem:
see errorlog in "detailed information" window


Version-Release number of selected component (if applicable):
system-config-network-1.5.3

How reproducible:
Always


Steps to Reproduce:
1.update configuration on wired interface from static to DHCP.
2.File->Save.
3.Then it crashes

Actual Results:


Expected Results:


Additional info:
Component: system-config-network
Version: 1.5.3
Summary: TBe93ef273 Conf.py:998:__setitem__:TypeError: coercing to Unicode: need string or buffer, NoneType found

Traceback (most recent call last):
  File "/usr/share/system-config-network/netconfpkg/gui/maindialog.py", line 831, in on_applyButton_clicked
    self.save()
  File "/usr/share/system-config-network/netconfpkg/gui/maindialog.py", line 392, in save
    self.saveHardware()
  File "/usr/share/system-config-network/netconfpkg/gui/maindialog.py", line 420, in saveHardware
    hardwarelist.save()
  File "/usr/share/system-config-network/netconfpkg/NCHardwareList.py", line 700, in save
    hw.save()
  File "/usr/share/system-config-network/netconfpkg/plugins/NCHWEthernet.py", line 44, in save
    modules[self.Name] = dic
  File "/usr/share/system-config-network/netconfpkg/conf/Conf.py", line 998, in __setitem__
    replace = key + ' ' + varname + ' ' + endofline
TypeError: coercing to Unicode: need string or buffer, NoneType found

Local variables in innermost frame:
findexp: ^[      ]*alias[        ]+eth1[         ]+
missing: 1
varname: eth1
self: <netconfpkg.NCHardwareList.MyConfModules instance at 0x8b260ec>
value: {'alias': None, 'options': {}, 'install': [], 'remove': []}
place: 0
key: alias
endofline: None