r4888: Don't try to thumbnail zero-byte files. They're either empty, or special and
tree41dcf57571b3ab8493b85904ecc53e84264fa5d5
drwxr-xr-x - Choices
-rw-r--r-- 2980 README
-rw-r--r-- 3247 README-es
-rw-r--r-- 738 ROX-Filer.xml
drwxr-xr-x - ROX-Filer
-rwxr-xr-x 5816 install.sh
-rw-r--r-- 186 rox.xml