FIX: GetAutoCompleteRealms() returning nothing

FIX: GetAutoCompleteRealms() returning nothing

Added a catch for GetAutoCompleteRealms() returning an empty result which caused the addon to fail with the following error:

BagSync\BagSync-v8.7.lua:1128: bad argument #1 to 'pairs' (table expected, got no value)
[C]: in function `pairs'
BagSync\BagSync-v8.7.lua:1128: in function `?'
BagSync\BagSync-v8.7.lua:94: in function <BagSync\BagSync.lua:92>

Locals:
(*temporary) = "table expected, got no value"
 = <function> defined =[C]:-1