Tom Samstag 4b32841dd4 fix some crashes in export preview ...

These issues were all found while trying to use the "Calculate Previews"
feature of the export wizard.

gen/proxy/referencedbyselection.py: ProxyDbBase need not define the
writable functions (add_*, commit_*, del_*) in its __tables. ProxyDbBase
doesn't have methods for add_person, etc, so this was causing an
AttributeError

gen/proxy/referencedbyselection.py: Add some handle checks to prevent
lookups on None handles

gen/proxy/proxybase.py: remove redundant test

2016-03-03 00:11:17 -08:00

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