strip array with 1 cell to single value.

result will keep multi-cell-arrays for 
output example:
"URICharsDecide_Cli":3.49
"RequestSizeDecide_Cli":9918.59
"@timestamp":1387465916
"UserAgentDist_Cli":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]