If there is no audio track in the kdenlive project, there should be no audio track in the rendered video file.
You can switch off the creation of an audio stream in the Render dialog window: Switch on “More Options” and then take the check mark off the “Audio” selector.
I asked this question in the Kdenlive Cafe session held today, and the devs acknowledged that there is room for improvement. So we will see what changes they may make 
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