Here's a command-line version of bart's excellent solution:
src]$ mkdir empty; cd empty; touch {a,b,c}.{a,b,c}
empty]$ echo foo > d.d
empty]$ ls
a.a a.b a.c b.a b.b b.c c.a c.b c.c d.d
empty]$ perl -e'-f and !-s _ and unlink for @ARGV' *.*
empty]$ ls
d.d
empty]$
Slightly golfier is good on the command line; this is marginally shorter and calls
unlink only once, on a list,
empty]$ perl -e'unlink grep -f && !-s _, @ARGV' *.*
If you don't have to worry about named pipes and other filesystem exotica, you can reduce that to,
empty]$ perl -e'unlink grep !-s, @ARGV' *.*
since directories are at least one block long.
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