QmlJS checks: Correct the check for dangerous == and add tests.

Change-Id: Ie0f4062069bf241020868af34ce6d36146b4b0c7
Reviewed-on: http://codereview.qt-project.org/4646
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@nokia.com>

src/libs/qmljs/qmljsevaluate.cpp

@@ -267,6 +267,8 @@ bool Evaluate::visit(AST::ArrayLiteral *)
 
 bool Evaluate::visit(AST::ObjectLiteral *)
 {
+    // ### properties
+    _result = _valueOwner->newObject();
     return false;
 }