Crash when property accidentally defined twice

[dirkschulze]

If one uses <pre class='propdef'> twice with the same property name for Name: twice, bikeshed crashes with:

Traceback (most recent call last):
File "/Users/dschulze/Downloads/bikeshed/bikeshed.py", line 1557, in
main()
File "/Users/dschulze/Downloads/bikeshed/bikeshed.py", line 103, in main
config.doc.preprocess()
File "/Users/dschulze/Downloads/bikeshed/bikeshed.py", line 1161, in preprocess
processAutolinks(self)
File "/Users/dschulze/Downloads/bikeshed/bikeshed.py", line 884, in processAutolinks
error=(text not in doc.ignoredTerms))
File "/Users/dschulze/Downloads/bikeshed/lib/ReferenceManager.py", line 116, in getRef
refs[0]['type'],
UnboundLocalError: local variable 'refs' referenced before assignment

[dirkschulze]

Same with definitions of keywords. Even if <dl> list has different dfn-fors.

[tabatkins]

Fixed - copypaste error from when I moved some code around. This should have died at an earlier point, though, when it detected the duplicate propdef. I'll have to look into that separately.