tests/sys_crypto/tests-crypto-modes-ccm: add test for input_len=0
tests/sys_crypto/tests-crypto-modes-ccm: add test for input_len=0

RIOT-OS/RIOT,kaspar030/RIOT,OTAkeys/RIOT,yogo1212/RIOT,miri64/RIOT,OTAkeys/RIOT,miri64/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,basilfx/RIOT,miri64/RIOT,kYc0o/RIOT,kaspar030/RIOT,kaspar030/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,ant9000/RIOT,yogo1212/RIOT,basilfx/RIOT,kYc0o/RIOT,OTAkeys/RIOT,yogo1212/RIOT,ant9000/RIOT,kYc0o/RIOT,kaspar030/RIOT,OlegHahm/RIOT,yogo1212/RIOT,yogo1212/RIOT,miri64/RIOT,jasonatran/RIOT,authmillenon/RIOT,OlegHahm/RIOT,authmillenon/RIOT,jasonatran/RIOT,OlegHahm/RIOT,basilfx/RIOT,authmillenon/RIOT,miri64/RIOT,basilfx/RIOT,ant9000/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,authmillenon/RIOT,ant9000/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,kaspar030/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,authmillenon/RIOT,basilfx/RIOT,OlegHahm/RIOT,ant9000/RIOT,kYc0o/RIOT,jasonatran/RIOT,kYc0o/RIOT