terminalwriter: remove unneeded hasattr use
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			@ -85,10 +85,11 @@ class TerminalWriter:
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        self.hasmarkup = should_do_markup(file)
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        self._chars_on_current_line = 0
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        self._width_of_current_line = 0
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        self._terminal_width = None  # type: Optional[int]
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    @property
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    def fullwidth(self) -> int:
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        if hasattr(self, "_terminal_width"):
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        if self._terminal_width is not None:
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            return self._terminal_width
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        return get_terminal_width()
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