fixed series summary for seasons

>    Traceback (most recent call last):
  File "/home/******/******/pythonbits/pythonbits.py", line 147, in <module>
    main(sys.argv)
  File "/home/******/******/pythonbits/pythonbits.py", line 112, in main
    summary = generateSeriesSummary(summary)
  File "/home/******/******/pythonbits/pythonbits.py", line 25, in generateSeriesSummary
    description = description + "[quote]%s\n[spoiler]%s[/spoiler][/quote]\n" % (summary['seriessummary'], summary['summary'])
KeyError: 'seriessummary'