When the JSON PMDA parses metadata, on errors just skip the current metric.
When the JSON PMDA parses metadata, on errors just skip the current metric.

* src/pmdas/json/pmdajson.python (JsonSource.__parse_array_metadata): If
  we get an error when setting the name, instead of erroring out, just
  skip the metric.
  (JsonSource.__parse_metadata): Ditto.

adfernandes/pcp,prasincs/pcp,tjanez/pcp,edwardt/pcp,aeg-aeg/pcpfans,adfernandes/pcp,adfernandes/pcp,aeg-aeg/pcpfans,aeg-aeg/pcpfans,prasincs/pcp,aeg-aeg/pcpfans,prasincs/pcp,adfernandes/pcp,wuliming/pcp,aeg-aeg/pcpfans,edwardt/pcp,aeg-aeg/pcpfans,wuliming/pcp,wuliming/pcp,tjanez/pcp,edwardt/pcp,prasincs/pcp,prasincs/pcp,adfernandes/pcp,wuliming/pcp,tjanez/pcp,aeg-aeg/pcpfans,edwardt/pcp,adfernandes/pcp,adfernandes/pcp,edwardt/pcp,tjanez/pcp,wuliming/pcp,aeg-aeg/pcpfans,edwardt/pcp,prasincs/pcp,prasincs/pcp,tjanez/pcp,tjanez/pcp,prasincs/pcp,edwardt/pcp,wuliming/pcp,wuliming/pcp,adfernandes/pcp,edwardt/pcp,tjanez/pcp,wuliming/pcp,tjanez/pcp