Create an empty package iterator when we don't know about the given file.
This is an easy way to stop segfaults when trying to destroy iterators for
unknown files.
2 exec_prefix=@exec_prefix@
4 includedir=@includedir@
7 Description: library for depsolving, installing and removing packages
10 Libs: -L${libdir} -lexpat -lz -lcurl
11 Cflags: -I${includedir}/razor