Nikolaj Sjujskij avatar Nikolaj Sjujskij committed 5c20a58

Check if input file exists

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         sys.stderr.write("Invalid argument number\n")
     rstfile, epubfile = sys.argv[1:]
+    if not (os.path.exists(rstfile) and os.path.isfile(rstfile)):
+        sys.stderr.write("Input file does not exist or is not a file\n")
+        sys.exit(1)
     main(rstfile, epubfile)
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