Improve speed for ImageListViewCacheMetadata.FromFile()

[GoogleCodeExporter]

Having a project where I (intentionally) am adding multiple non-existing paths 
to the list view, I get a (caught) exception in

public static ImageMetadata ImageListViewCacheMetadata.FromFile(string path, 
bool useWIC)

Since exceptions have a rather bad performance, I suggest to add one single 
check:

...
FileInfo info = new FileInfo(path);
if( !info.Exists ) { return imageInfo; } // <-- Add this line.
...

This would improve my program performance significantly.

Original issue reported on code.google.com by [email protected] on 12 Nov 2010 at 12:57