is_unambiguous: fix detection of empty languages
* src/tests/unambig.test: New test case. Reported by Ming-Hsien Tsai. * src/twaalgos/sccfilter.cc: Always create an initial state. * src/twaalgos/isunamb.cc: Speed up on empty languages. * NEWS, THANKS: Update.
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THANKS
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@ -21,6 +21,7 @@ Kristin Y. Rozier
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Martin Dieguez Lodeiro
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Michael Tautschnig
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Michael Weber
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Ming-Hsien Tsai
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Nikos Gorogiannis
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Rüdiger Ehlers
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Silien Hong
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