guard against returning NaN when normalizing zero vectors
guard against returning NaN when normalizing zero vectors

common-voice/common-voice,gozer/voice-web,gozer/voice-web,common-voice/common-voice,gozer/voice-web,gozer/voice-web,gozer/voice-web,gozer/voice-web,common-voice/common-voice,gozer/voice-web,common-voice/common-voice