No data in response fix
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@ -1517,6 +1517,9 @@ class ELM:
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nBytes = 0 # number bytes in response
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nFrames = 0 # numer frames in response
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if len (responses) == 0: # no data in response
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return ""
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if responses[0][:1] == '0': # single frame (sf)
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nBytes = int(responses[0][1:2], 16)
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nFrames = 1
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