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* src/bin/autfilt.cc: Return with exit code 1 if no match found. * src/tgbaalgos/are_isomorphic.cc,src/tgbatest/degenlskip.test src/tgbatest/explpro2.test,src/tgbatest/explpro3.test src/tgbatest/explpro4.test,src/tgbatest/explprod.test src/tgbatest/neverclaimread.test, src/tgbatest/readsave.test src/tgbatest/tripprod.test: Use exit status to check for output emptiness instead of 'test -n'. * src/tgbatest/isomorph.test: Simplify test.
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