Description of problem:

If I click the "graph" link in "show dependency tree/graph", it gives me the following error


 Software error:

Error in tempfile() using data/webdot/XXXXXXXXXX.dot: Parent directory (data/webdot/) is not a directory at /var/www/html/bugzilla/showdependencygraph.cgi line 114


How reproducible:
always

Steps to Reproduce:
1. Open a bug which has other bugs block it
2. click the "graph" link in "show dependency tree/graph" right under the Blocks section
3.
  
Actual results:

 Software error:

Error in tempfile() using data/webdot/XXXXXXXXXX.dot: Parent directory (data/webdot/) is not a directory at /var/www/html/bugzilla/showdependencygraph.cgi line 114


Expected results:
It is a new feature I think, so I don't know exactly the right result should be, but definitely not the "software error"


Additional info: