The catchlines of the several sections of this code printed in boldface type are intended as mere catchwords to indicate the contents of the sections and shall not be deemed or taken to be the titles of the sections, nor as any part of the sections, nor, unless expressly so provided, shall they be so deemed when any of the sections, including the catchlines, are amended or reenacted. No provision of this code shall be held invalid by reason of deficiency in any such catchline or in any heading or title to any chapter, subchapter, or division.