[osg-submissions] Various plugin fixes

[Paul Martz]

Hi Robert --
 
Attached are some minor plugin fixes. PNM, RGB, and JPEG would all crash if
attempting to read an empty file, and FLT would go into an infinite loop.
All are fixed with this change.
 
I also fixed some return values for a couple of these, changing
FILE_NOT_HANDLED to ERROR_IN_READING_FILE where appropriate.
 
Paul Martz
Skew Matrix Software LLC
http://www.skew-matrix.com <http://www.skew-matrix.com/> 
+1 303 859 9466
 
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