a) The AVRDude project properties are also shown for static library projects where they do not make sense.
b) Trying to upload am AVR static library project with AVRDude will cause an nondescript "Nothing to upload" error message.
The Plugin should a) inhibit the AVRDude properties for static library project and b) print a more descriptive error message when trying to upload a static library project.
Fixed in SVN. Will be in Release 2.3.2