Error if the string is not encoded in utf-8

[SrujithPoondla]

The current code doesn't handle non unicode format strings. If the string is not encoded in utf-8 then it throws the UnicodeDecodeError.

Error:
UnicodeDecodeError: 'utf8' codec can't decode byte 0xd1 in position 8: invalid continuation byte

Dev Analysis:
String : "sharkey_„Žs cafe"
I used convert_to_unicode in utils.py to convert non unicode strings to unicode but still it was not able to parse the non unicode characters. At this moment we are ignoring the non unicode strings, but they need to be handled.