Whenever any board of school directors shall have heretofore contracted for labor, materials, and supplies, for the school district, the purchase of which by contract are authorized under the provisions of the school laws of the Commonwealth, and such board of school directors has actually received such labor, materials, and supplies, and the same are being used by the school district--if the said contract does not evidence any fraud or conspiracy to violate the provisions of the school laws of the Commonwealth, and the school district has not suffered any pecuniary loss as the result of such contract, then such contract shall be valid and binding on the school district and payment for such labor, materials, and supplies, by the school district is hereby ratified, confirmed, and validated, notwithstanding the fact that the affirmative votes of the majority of the board of school directors were not recorded in the minutes showing how each member voted, as required by law. No board of school directors, or any members thereof, shall be subject to surcharge for payments made by any board of school directors on any such contract.