Merge pull request #2106 from asger-semmle/call-graph-3

JS: Call graph changes

javascript/ql/src/LanguageFeatures/IllegalInvocation.ql

@@ -61,5 +61,7 @@ where
   forex(DataFlow::InvokeNode cs2, Function otherCallee |
     cs2.getInvokeExpr() = cs.getInvokeExpr() and otherCallee = cs2.getACallee() |
     illegalInvocation(cs, otherCallee, _, _)
-  )
+  ) and
+  // require that all callees are known
+  not cs.isIncomplete()
 select cs, "Illegal invocation of $@ " + how + ".", callee, calleeDesc