removed unused var

lib/core/option.py

@@ -1489,7 +1489,6 @@ def _setKnowledgeBaseAttributes(flushAll=True):
 
     kb.brute = AttribDict({"tables":[], "columns":[]})
     kb.bruteMode = False
-    kb.busyFlag = False
 
     kb.cache = AttribDict()
     kb.cache.content = {}