[downloader/external] Simplify source_address
'' might actually be passed in, so check for None.
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					 1 changed files with 3 additions and 4 deletions
				
			
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			@ -46,11 +46,10 @@ class ExternalFD(FileDownloader):
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        return info_dict['protocol'] in ('http', 'https', 'ftp', 'ftps')
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    def _source_address(self, command_option):
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        command_part = []
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        source_address = self.params.get('source_address')
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        if source_address:
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            command_part = [command_option, source_address]
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        return command_part
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        if source_address is None:
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            return []
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        return [command_option, source_address]
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    def _call_downloader(self, tmpfilename, info_dict):
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        """ Either overwrite this or implement _make_cmd """
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