fix malformed json for empty row {0} to "{0}0" #2588
Merged
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When using
rtl_433 -F json -X 'n=raw,m=FSK_MC_ZEROBIT'
sometimes rtl_433 outputs json containing an invalid dictionary:
"codes" : [{0}]
Fix the source to output "{0}0" in case of an empty row.
Closes #2577