No contract shall be made by the corporate authorities, or by any committee or member thereof, and no expense shall be incurred by any of the officers, employees or departments of the village, whether the object of the expenditure has been ordered by the corporate authorities or not, unless the expenditure is consistent with the budget ordinance as amended concerning that contract or expense. Any contract made, or any expense otherwise incurred, in violation of the provisions of this section shall be null and void as to the village, and no money belonging thereto shall be paid on account thereof. However, pending the passage of the annual budget for any fiscal year, the corporate authorities may authorize the Village Manager to make necessary expenditures for the support thereof upon the basis of the budget ordinance of the preceding fiscal year. However, if it is determined by two-thirds vote of the corporate authorities then holding office, at a regularly scheduled meeting of the corporate authorities, that it is expedient and in the best public interest to begin proceedings for the construction of a needed public work, then the provisions of this section shall not apply to the extent that the corporate authorities may employ or contract for professional services necessary for the planning and financing of such public work.