Fixed error and prop spam

Loading ghost stuck on 16% and spamming props each tick.
````
[ERROR] addons/advduplicator/lua/weapons/gmod_tool/stools/adv_duplicator.lua:321: attempt to index field 'EntityMods' (a nil value)
  1. MakeGhostFromTable - addons/advduplicator/lua/weapons/gmod_tool/stools/adv_duplicator.lua:321
   2. AddToGhost - addons/advduplicator/lua/weapons/gmod_tool/stools/adv_duplicator.lua:539
    3. Think - addons/advduplicator/lua/weapons/gmod_tool/stools/adv_duplicator.lua:285
     4. unknown - gamemodes/sandbox/entities/weapons/gmod_tool/shared.lua:194
````
![2013-08-13_00002](https://f.cloud.github.com/assets/332791/953353/a0c895fc-03f3-11e3-895f-5a02219a803d.jpg)