come_from_opt handles and/or precidence properly

main.py: give a better error message when file is not found.

uncompyle6/main.py

@@ -94,6 +94,11 @@ def main(in_base, out_base, files, codes, outfile=None,
 
     for filename in files:
         infile = os.path.join(in_base, filename)
+        if not os.path.exists(infile):
+            sys.stderr.write("File '%s' doesn't exist. Skipped\n"
+                             % infile)
+            continue
+
         # print (infile, file=sys.stderr)
 
         if of: # outfile was given as parameter