[gwt-contrib] Disallow persisted entities with null version properties because it breaks RequestFactory update... (issue1201801)

[bobv]

Reviewers: rjrjr,

Description:
Disallow persisted entities with null version properties because it
breaks RequestFactory update semantics.
Patch by: bobv
Review by: rjrjr

Please review this at http://gwt-code-reviews.appspot.com/1201801/show

Affected files:
  M  
user/src/com/google/gwt/requestfactory/server/SimpleRequestProcessor.java
  M user/test/com/google/gwt/requestfactory/client/RequestFactoryTest.java
  M user/test/com/google/gwt/requestfactory/server/SimpleFoo.java
  M user/test/com/google/gwt/requestfactory/shared/ComplexKeysTest.java
  M user/test/com/google/gwt/requestfactory/shared/SimpleFooRequest.java


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