TypeError: Can't convert 'NoneType' object to str implicitly about eagle2kicad HOT 1 CLOSED

$ python3 Start.py -L tmp/SparkFun-Aesthetics.lbr a b
Error Converting Library: 'SparkFun-Aesthetics'
Error: Can't convert 'NoneType' object to str implicitly
See Log.txt for more info
$ cat Log.txt
###############################################################################
#Session: 2014-12-28 17:35:17
###############################################################################


*******************************************
Converting Lib: tmp/SparkFun-Aesthetics.lbr
Module Output: b
Symbol Output: a
Lib Name: SparkFun-Aesthetics
Conversion Failed

Traceback (most recent call last):
  File "Start.py", line 141, in convertLib
    lib.writeLibrary(modFile, symFile)
  File "/home/abe/prog/github/DanChianucci/Eagle2Kicad/Library/Library.py", line 65, in writeLibrary
    self.writeSymFile(symFile)
  File "/home/abe/prog/github/DanChianucci/Eagle2Kicad/Library/Library.py", line 86, in writeSymFile
    devicepart.write(symFile)
  File "/home/abe/prog/github/DanChianucci/Eagle2Kicad/Common/Symbol.py", line 39, in write
    symFile.write("#Generated for " + self.device.fullName + " package " + self.device.package + "\n")
TypeError: Can't convert 'NoneType' object to str implicitly
*******************************************

$ diff -b Symbol.py Symbol.py.cur
7a8,10
> def xstr(s):
>     return '' if s is None else str(s)
> 
39c42,46
<         symFile.write("#Generated for " + self.device.fullName + " package " + self.device.package + "\n")
---
>         #if self.device.package is None:
>         #  print( "!!!", self.device.package, self.device.fullName, self.name )
>         #symFile.write("#Generated for " + self.device.fullName + " package " + xstr(self.device.package) + "\n")
> 
>         symFile.write("#Generated for " + xstr(self.device.fullName) + " package " + xstr(self.device.package) + "\n")
46c53
<         symFile.write(" " + self.device.package + "\n")
---
>         symFile.write(" " + xstr(self.device.package) + "\n")