Fix a lot of NULL errors in WireLib.CanTool and WireLib.CheckFont - #3724
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Fixes:
```
- addons/wire/lua/wire/server/wirelib.lua:1650: attempt to call method 'SteamID' (a nil value)
1. CheckFont - addons/wire/lua/wire/server/wirelib.lua:1650
2. SendConfig - addons/wire/lua/entities/gmod_wire_textscreen.lua:282
3. Retransmit - addons/wire/lua/entities/gmod_wire_textscreen.lua:306
4. func - addons/wire/lua/wire/wireshared.lua:543
5. <unknown> - lua/includes/extensions/net.lua:34
```
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Fixes:
+Fixes a lot of possible errors when owner in WireLib.CanTool is NULL (for example when owner disconnected)