[assist] The right assistant should silence errors if there's a missing table with DB in a qualified identifier

i.e "SELECT * FROM bogus_db.bogus_tbl"

can return:

{"status": 0, "code": 500, "error": "AuthorizationException: User 'hue' does not have privileges to access: bogus_db.bogus_tbl\n"}

XMLHttpRequest.send @ (index):7477
send @ jquery.js:8623
ajax @ jquery.js:8152
fetchAssistData @ apiHelper.65fa2c76fddb.js:2202
ApiHelper.fetchPanelData @ apiHelper.65fa2c76fddb.js:1755
AssistDbEntry.loadEntries @ assistDbEntry.9f5e644fdcdf.js:465
(anonymous) @ assistDbEntry.9f5e644fdcdf.js:69
notifySubscribers @ knockout-latest.debug.js:1320
(anonymous) @ knockout-latest.debug.js:1359
e @ knockout-latest.debug.js:1087
t @ knockout-latest.debug.js:1097
attributes (async)
(anonymous) @ knockout-latest.debug.js:1048
n @ knockout-latest.debug.js:1104
schedule @ knockout-latest.debug.js:1112
(anonymous) @ knockout-latest.debug.js:1195
i._limitChange @ knockout-latest.debug.js:1366
d @ knockout-latest.debug.js:1272
valueHasMutated @ knockout-latest.debug.js:1529
t @ knockout-latest.debug.js:1495
(anonymous) @ assistDbSource.f66efeade552.js:215
(anonymous) @ hue.utils.2060433e101e.js:472
publish @ hue.utils.2060433e101e.js:470
(anonymous) @ ko.hue-bindings.298605e63dd5.js:4111
(anonymous) @ ko.hue-bindings.298605e63dd5.js:4046
c @ jquery.js:3073
add @ jquery.js:3119
identifyComplexLocations @ ko.hue-bindings.298605e63dd5.js:4038
(anonymous) @ ko.hue-bindings.298605e63dd5.js:4058
(anonymous) @ hue.utils.2060433e101e.js:472
publish @ hue.utils.2060433e101e.js:470
aceSqlLocationWorker.onmessage @ VM826:1135