don't throw an error on empty shapes- those are perfectly normal e.g.
[swftools.git] / avi2swf /
drwxr-xr-x   ..
-rw-r--r-- 486 Makefile.in
-rw-r--r-- 1114 avi2swf.1
-rw-r--r-- 19008 avi2swf.cc