(a) It is the intent of the legislature that this subchapter, or an act performed under this subchapter, may not be:
(1) used as an issue involved in a labor dispute; or
(2) used or asserted to advantage in collective bargaining by employers, employees, or their respective representatives.
(b) Notwithstanding any other provision of this subchapter, this subchapter does not apply to a place of employment while that place of employment is subject to picketing or to a strike, slowdown, or other work stoppage.