empty `event_name' causes premature failure

[Mark Williams]

epgsnoop fails with the following exception:

+------
Traceback (most recent call last):
  File "/home/mark/bin/epgsnoop", line 183, in <module>
    programs = snooper.snoop()
  File "/home/mark/lib/python2.6/site-packages/epgsnoop/snooper.py", line 157, in snoop
    found = self.processPacket(pkt)
  File "/home/mark/lib/python2.6/site-packages/epgsnoop/snooper.py", line 80, in processPacket
    event['title'] = self.detail_regex.findall(data)[0].decode('latin-1')
IndexError: list index out of range
+------

... which I think is caused by a UK EIT stream where dvbsnoop outputs the following:

+------
            DVB-DescriptorTag: 77 (0x4d) [= short_event_descriptor]
            descriptor_length: 5 (0x05)
              ISO639_2_language_code: EST
            event_name_length: 0 (0x00)
            event_name: ""
            text_length: 0 (0x00)
            text_char: ""

            DVB-DescriptorTag: 77 (0x4d) [= short_event_descriptor]
            descriptor_length: 104 (0x68)
              ISO639_2_language_code: eng
            event_name_length: 27 (0x1b)
            event_name: "Overnights with Gareth John" -- Charset: Latin alphabet
            text_length: 72 (0x48)
            text_char: "Gareth gets you through the wee small hours with even More Music Variety" -- Charset: Latin alphabet
+------

The `event_name' line does not have `-- Charset' part for the empty [Estonian!] short event descriptor. The attached patch appears to stop the exception, although I do not know whether it is the correct way to handle such output from dvbsnoop or whether these short event descriptors could occur in a different order, etc.

[hads (hads)]

Thanks very much. I just pushed revision 68 with a slightly changed version of your patch.