Section 5 — Municipal elections not liable to be challenged

No municipal election shall be liable to be challenged- (a) on the ground of non-publication or improper publication of the electoral rolls of the different wards constituting the municipality for which such election has been held or is hereafter to be held if such rolls have been published in the manner specified in the section 3 of this Act, or (b) on the ground of the Returning Officer therefor having been appointed before the publication of the notification under section 23 of the Act.