* allout-widgets.el (allout-widgets-post-command-business): Stop decorating

* allout-widgets.el (allout-widgets-post-command-business): Stop decorating
intermediate isearch matches.  They're not being undecorated when an
isearch is continued past, and isearch automatically collapses them.  This
leads to "widget leaks", where decorated items accumulate in collapsed
areas.  Lines with lots of hidden widgets can slow down cursor travel,
substantially.  Too much complicated machinery would be needed to ensure
undecoration, so we're doing without this nicety.

(allout-widgets-tally-string): Don't try to do a hash-table-count of
allout-widgets-tally when it's nil.  This eliminates spurious "Error during
redisplay: (wrong-type-argument hash-table-p nil)" warnings in *Messages*
when allout-widgets-maintain-tally is t.