Improve the error on init/require if a package could not be found
Improve the error on init/require if a package could not be found

nicolas-grekas/composer,milleruk/composer,dzuelke/composer,composer/composer,gencer/composer,localheinz/composer,floverdevel/composer,alcohol/composer,vdm-io/composer,stof/composer,slbmeh/composer,pierredup/composer,stefangr/composer,johnstevenson/composer,staabm/composer,andrerom/composer,erasys/composer,naderman/composer,SpacePossum/composer,fabpot/composer