fail gracefully on program without any loadable sections

[Alexandre Oliva]

If a program doesn't have any loadable sections, we crash in a
not-very-beautiful way.  This gets us to reject the binary in a more
graceful manner.  Ok to install?

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-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                 aoliva@{redhat.com, gcc.gnu.org}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist                Professional serial bug killer