IDE+Runtime: fix exception when reconnecting with non-empty trace/force list.

Sometimes, remote call to SetTraceVariableList returned None just after reconnecting:
- changed caller to accept None (in case of connection problem)
- changer SetTraceVariable list to return 4 (DEBUG_SUSPENDED) if debug is suspended

     1

{

     2

    "ID": "wamptest", 

     3

    "active": true, 

     4

    "protocolOptions": {

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        "autoPingInterval": 60, 

     6

        "autoPingTimeout": 20

     7

    }, 

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    "realm": "Automation", 

     9

    "url": "ws://127.0.0.1:8888"

    10

}