Monad crashing blender on SvNoDataError exception

Created by: DolphinDream

In current master branch.. if i disconnect a vector input from a modad blender crashes with the following error. Try to delete a vector node connecting to the monad and undo a few times until it (hopefully) you get it to crash.

https://gist.github.com/cda35a4ae53012f63b7b61fdc035c990

2017-12-08 19:40:35,091 [ERROR] sverchok.core.update_system: Node Monad had exception: No data passed into socket `Location'
Traceback (most recent call last):
  File "/scripts/addons/sverchok/core/update_system.py", line 323, in do_update_general
    node.process()
  File "/scripts/addons/sverchok/core/monad.py", line 462, in process
    data = socket.sv_get(deepcopy=False)
  File "/scripts/addons/sverchok/node_tree.py", line 297, in sv_get
    raise SvNoDataError(self)
sverchok.core.socket_data.SvNoDataError: No data passed into socket `Location'


Writing: /tmp/monadBug.crash.txt
Segmentation fault: 11

Note the monad is stuck for some reason in orange land even though everything is connected. The same crash happens btw even if i start from scratch to get a monad that is not orange (which i suspect has to do to something not updating properly)