blob not storing any value for any reason

Recording a video with webRTC I have no data and after debugging I just realiced that there's any content in the Blob variable (that must store the video).

According to the code I pasted on my jsfiddle, line 136 should contain something like

Blob {type: "audio/wav", size: 360492, slice: function}size: 360492type: "audio/wav"

But I'm having undefined value.

Could anybody tell me what am I doing wrongly?

Thanks in advice!