lp1010187 eliminate redundant/unnecessary calls

Particularly invocations of open-ils.circ.stat_cat.asset.retrieve.all in the
Item Attribute Editor

To test:

    login with a BR1 workstation
    load a pristine (non-stat-cat-laden) BR1 item with the editor
    there should be no call to open-ils.circ.stat_cat.asset.retrieve.all
    change the Circ Lib on the item to BR4
    reload the item in the editor
    there should be a call to open-ils.circ.stat_cat.asset.retrieve.all
    reload the item in the editor
    there should be no call to open-ils.circ.stat_cat.asset.retrieve.all
    assign the item a stat cat entry owned by CONS
    reload the item in the editor
    there should be no call to open-ils.circ.stat_cat.asset.retrieve.all

Signed-off-by: Jason Etheridge <jason@esilibrary.com>
Signed-off-by: Jason Stephenson <jstephenson@mvlc.org>