234 - avoid divide by zero, extra diags
234 - avoid divide by zero, extra diags

Added when debugging a QA failure.

ryandoyle/pcp_original,andyvand/cygpcpfans,wuliming/pcp,wuliming/pcp,wuliming/pcp,aeg-aeg/pcpfans,ryandoyle/pcp_original,tjanez/pcp,edwardt/pcp,wuliming/pcp,andyvand/cygpcpfans,prasincs/pcp,aeg-aeg/pcpfans,ryandoyle/pcp_original,mbaldessari/pcp,andyvand/cygpcpfans,tjanez/pcp,andyvand/cygpcpfans,prasincs/pcp,wuliming/pcp,aeg-aeg/pcpfans,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,prasincs/pcp,edwardt/pcp,tjanez/pcp,andyvand/cygpcpfans,aeg-aeg/pcpfans,edwardt/pcp,tjanez/pcp,tjanez/pcp,tjanez/pcp,aeg-aeg/pcpfans,ryandoyle/pcp_original,wuliming/pcp,wuliming/pcp,aeg-aeg/pcpfans,tjanez/pcp,mbaldessari/pcp,ryandoyle/pcp_original,ryandoyle/pcp_original,adfernandes/pcp,wuliming/pcp,prasincs/pcp,aeg-aeg/pcpfans,tjanez/pcp,ryandoyle/pcp_original,mbaldessari/pcp,prasincs/pcp,edwardt/pcp,ryandoyle/pcp_original,mbaldessari/pcp,prasincs/pcp,andyvand/cygpcpfans,mbaldessari/pcp,adfernandes/pcp,andyvand/cygpcpfans,adfernandes/pcp,edwardt/pcp,andyvand/cygpcpfans,prasincs/pcp,edwardt/pcp,aeg-aeg/pcpfans,prasincs/pcp,adfernandes/pcp,edwardt/pcp,mbaldessari/pcp,edwardt/pcp