Improve error message on invalid output template and abort execution
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					 1 changed files with 2 additions and 1 deletions
				
			
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			@ -404,7 +404,8 @@ class FileDownloader(object):
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			template_dict['ord'] = unicode('%05d' % self._num_downloads)
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			filename = self.params['outtmpl'] % template_dict
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		except (ValueError, KeyError), err:
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			self.trouble('ERROR: invalid output template or system charset: %s' % str(err))
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			self.trouble(u'ERROR: invalid system charset or erroneous output template')
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			return
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		if self.params.get('nooverwrites', False) and os.path.exists(filename):
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			self.to_stderr(u'WARNING: file exists: %s; skipping' % filename)
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			return
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