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Sometimes we can't output anything because we don't have enough incoming frames. In that case, the resampler was trying to call do_quantize() and do_resample() in a loop forever because there would never be samples to output (so chain->samples would always be NULL). Fix this by not calling chain->make_func() in a loop -- seems completely unnecessary since calling it over and over won't change anything if the make_func() can't output samples. Also add some checks for the input and / or output being NULL when doing conversion or quantization. This will happen when we have nothing to output. We can't bail early, because we need resampler->samples_avail to be updated in gst_audio_resampler_resample(), so we must call that and no-op everything along the way. Part-of: <!1289>
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