views/entry.py: remove "check for collision" overhead
views/entry.py: remove "check for collision" overhead

Check every calculated path for collisions is really time consuming
with many entries. Now if it finds a collision, the file will be
removed and it raises an exception.

When you run it the next time, the file does not exist and can be
rebuild from cache/file.

markvl/acrylamid,markvl/acrylamid,markvl/acrylamid