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Fix bug in _checkquote that raised an exception on empty "arg".
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@ -1008,9 +1008,9 @@ def _checkquote(self, arg):
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if type(arg) is not type(''):
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return arg
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if (arg[0],arg[-1]) in (('(',')'),('"','"')):
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if len(arg) >= 2 and (arg[0],arg[-1]) in (('(',')'),('"','"')):
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return arg
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if self.mustquote.search(arg) is None:
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if arg and self.mustquote.search(arg) is None:
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return arg
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return self._quote(arg)
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