Used as a call back function. Creates a missing object anc adds it to the missing array.

Type	Name	Documentation
DepNode named	missing	Package with the unfulfilled dependency.
named	flavor	Required flavor of missing package
named	pkgtype	Package Type of missing package.
PkgNode named	pkg	Package which owns the dependency that is unfulfilled.
PkgNode named	badversions	List of packages that fulfill the dependency but have the wrong version.