Console: Catch ISE in get/setAttribute() (ticket #1529)

apps/routerconsole/jsp/certs.jsp

apps/routerconsole/jsp/config.jsp

apps/routerconsole/jsp/configadvanced.jsp

apps/routerconsole/jsp/configclients.jsp

apps/routerconsole/jsp/configfamily.jsp

apps/routerconsole/jsp/confighome.jsp

apps/routerconsole/jsp/configi2cp.jsp

apps/routerconsole/jsp/configkeyring.jsp

apps/routerconsole/jsp/configlogging.jsp

apps/routerconsole/jsp/confignav.jsi

apps/routerconsole/jsp/confignet.jsp

apps/routerconsole/jsp/configpeer.jsp

apps/routerconsole/jsp/configplugins.jsp

apps/routerconsole/jsp/configreseed.jsp

apps/routerconsole/jsp/configsidebar.jsp

apps/routerconsole/jsp/configstats.jsp

apps/routerconsole/jsp/configtunnels.jsp

apps/routerconsole/jsp/configui.jsp

apps/routerconsole/jsp/configupdate.jsp

apps/routerconsole/jsp/configwebapps.jsp