sys/net/nanocoap: fail when start data cannot be parsed
sys/net/nanocoap: fail when start data cannot be parsed

miri64/RIOT,RIOT-OS/RIOT,smlng/RIOT,OlegHahm/RIOT,smlng/RIOT,toonst/RIOT,toonst/RIOT,basilfx/RIOT,miri64/RIOT,basilfx/RIOT,kaspar030/RIOT,mtausig/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,mtausig/RIOT,kaspar030/RIOT,kaspar030/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,smlng/RIOT,authmillenon/RIOT,aeneby/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,kaspar030/RIOT,smlng/RIOT,yogo1212/RIOT,authmillenon/RIOT,kYc0o/RIOT,x3ro/RIOT,ant9000/RIOT,x3ro/RIOT,RIOT-OS/RIOT,toonst/RIOT,OlegHahm/RIOT,josephnoir/RIOT,jasonatran/RIOT,mtausig/RIOT,basilfx/RIOT,authmillenon/RIOT,authmillenon/RIOT,josephnoir/RIOT,josephnoir/RIOT,ant9000/RIOT,toonst/RIOT,aeneby/RIOT,miri64/RIOT,mtausig/RIOT,aeneby/RIOT,yogo1212/RIOT,jasonatran/RIOT,x3ro/RIOT,ant9000/RIOT,kYc0o/RIOT,josephnoir/RIOT,RIOT-OS/RIOT,miri64/RIOT,authmillenon/RIOT,OTAkeys/RIOT,jasonatran/RIOT,toonst/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,authmillenon/RIOT,OTAkeys/RIOT,ant9000/RIOT,smlng/RIOT,kYc0o/RIOT,mtausig/RIOT,jasonatran/RIOT,miri64/RIOT,x3ro/RIOT,aeneby/RIOT,x3ro/RIOT,basilfx/RIOT,ant9000/RIOT,basilfx/RIOT,yogo1212/RIOT,OlegHahm/RIOT,yogo1212/RIOT,kaspar030/RIOT,kYc0o/RIOT,aeneby/RIOT,yogo1212/RIOT,josephnoir/RIOT,yogo1212/RIOT