erroneous printing to stdout when printing figures to nonexisting paths

[John W. Eaton]

On  8-Jan-2008, Paul Sundvall wrote:

| Description:
| -----------
| 
| When printing a graph to a file and the filename contains a path
| which does not exist, the file is printed to stdout (or possibly stderr).
| 
| 
| Repeat-By:
| ---------
| plot(rand(10,1))
| %this goes fine:
| print('existing_subdir/everything_is_ok.png')
| %this goes bad:
| print('nonexisting_subdir/we_have_a_problem.png')

Please try the following patch.  It will generate an error if the
directory does not already exist.

jwe


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