Errors if IDE cannot find a Leonardo board

[NicoHood]

Open an empty sketch, select Leonardo/Micro board and hit upload with no board connected.
You should remove that debug output:

processing.app.debug.RunnerException: Couldn't find a Board on the selected port. Check that you have the correct port selected.  If it is correct, try pressing the board's reset button after initiating the upload.
    at cc.arduino.packages.uploaders.SerialUploader.waitForUploadPort(SerialUploader.java:234)
    at cc.arduino.packages.uploaders.SerialUploader.uploadUsingPreferences(SerialUploader.java:130)
    at processing.app.debug.Compiler.upload(Compiler.java:165)
    at processing.app.Sketch.upload(Sketch.java:1260)
    at processing.app.Sketch.exportApplet(Sketch.java:1202)
    at processing.app.Sketch.exportApplet(Sketch.java:1174)
    at processing.app.Editor$DefaultExportHandler.run(Editor.java:2471)
    at java.lang.Thread.run(Thread.java:745)
Couldn't find a Board on the selected port. Check that you have the correct port selected.  If it is correct, try pressing the board's reset button after initiating the upload.

Edit: 1.6.3 on Win8

[ffissore]

Fixed by #3483