Allow undefined outputs + report lustre types in error messages instead of internal ones
Allow undefined outputs + report lustre types in error messages instead of internal ones

tinelli/kind2,mebsout/kind2,AdrienChampion/kind2,AdrienChampion/kind2,mebsout/kind2,mebsout/kind2,mebsout/kind2,tinelli/kind2,mebsout/kind2,mebsout/kind2,tinelli/kind2,tinelli/kind2,mebsout/kind2,mebsout/kind2,AdrienChampion/kind2,AdrienChampion/kind2,AdrienChampion/kind2,AdrienChampion/kind2,AdrienChampion/kind2,AdrienChampion/kind2,tinelli/kind2,daniel-larraz/kind2,tinelli/kind2,mebsout/kind2,AdrienChampion/kind2,kind2-mc/kind2