An imposing Austrian manly-man falls for the nanny even though he is attached to a hot and accomplished brunette, and Twitter explodes over it. No, it's not the Arnold Schwarzenegger " Maria Shriver " Mildred Baena love triangle, it's NBC's live staged version of The Sound of Music. The show wasn't half as good as the 1965 Julie Andrews original, but it was so cringe-worthy that it was at least fun to watch. Here'…