Committing existing Definitions is broken

[fritzo]

To Reproduce

1. use arrow keys to move cursor to a Define line

2. press Enter to commit

3. observe errors in js console

   GET http://localhost:34934/corpus/validities?_=1408586210624
   500 (Internal Server Error) jquery.js:4
   pollValidities GET failed: error log.js:12
   

4. quit puddle server and observe erroneous lines in corpus.dump

       DEFINE VAR undefined undefined
   

Workaround

1. quit puddle server
2. git co -- corpus.dump