skimage: if --readPath points at an empty dir, create an empty expectations file

tools/skimage_main.cpp

Index: tools/skimage_main.cpp
===================================================================
--- tools/skimage_main.cpp	(revision 9641)
+++ tools/skimage_main.cpp	(working copy)
@@ -515,7 +515,8 @@
                 decodeFileAndWrite(fullname.c_str(), outDirPtr);
             } while (iter.next(&filename));
         } else {
-            decodeFileAndWrite(FLAGS_readPath[i], outDirPtr);
+            // FLAGS_readPath[i] is an empty or nonexistent directory,

[scroggo, 2013/06/19 15:34:09]

I am okay with the spirit of this change, but this else case is supposed to
cover someone calling

skimage --readPath image.png

With this change, that use case is no longer supported.

[epoger, 2013/06/19 15:54:15]

Yup.  It is handy that --readPath can take either folders or files... but it
should probably handle empty directories differently than it does now (it acts
like the folder was a file it couldn't decode).

Anyway, happily, I don't need this change at present... 

+            // so do nothing.
         }
     }