[#702],[#703] fix 500s associated with wiki history

[#702] test for get_version returning None before looking at
attributes of the result

[#703] the migration didn't fix historical versions stored for
pages, so look for deleted attribute with getattr()

Wolf Wolf 2010-07-14

changed ForgeWiki/forgewiki/templates/browse.html
changed ForgeWiki/forgewiki/templates/page_view.html
changed ForgeWiki/forgewiki/wiki_main.py
ForgeWiki/forgewiki/templates/browse.html Diff Switch to side-by-side view
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ForgeWiki/forgewiki/templates/page_view.html Diff Switch to side-by-side view
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ForgeWiki/forgewiki/wiki_main.py Diff Switch to side-by-side view
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