Fixes handling of wrong exception in tags plugin.
Fixes handling of wrong exception in tags plugin.

The current code catches AttributeError instead of KeyError which is the
actual error being thrown. KeyError is caught when the variable is used
earlier in the same file but seems not to have been fixed in both
places.

Signed-off-by: Will Kahn-Greene <5d7e5a4e8e63c739e07f011adf51f2e51dd3ec09@bluesock.org>

willkg/douglas,daitangio/pyblosxom,daitangio/pyblosxom,willkg/douglas