The new employer is bound, with regard to the employees whose employment contracts remain in force, by the obligations incumbent on the former employer on the date of the change, except in the following cases:
1° Safeguard, receivership or compulsory liquidation proceedings ;
2° Substitution of employers without any agreement between them.
The first employer reimburses the sums paid by the new employer, due on the date of the change, unless the burden resulting from these obligations has been taken into account in the agreement between them.