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When the getOwnPropertyDescriptor method was invoked the input property descriptor was not cleared in every case. This could lead to problems when the property descriptor is not set/modified by the getOwnPropertyDescriptor call, resulting in a failure at a later state. Related to this the Proxy getOwnPropertyDescriptor method incorrectly returned "undefined" value in a single case. JerryScript-DCO-1.0-Signed-off-by: Peter Gal pgal.usz@partner.samsung.com