lattice plotting is erroring

[colinpmillar]

Bug in:

FLCore/R/plot.R

Lines 183 to 184 in 12ef46c

	do.call(xyplot, c(list(x=data ~ year|panel, data=obj, panel=pfun,
	groups=expression(qname)), options))

The following generates an error in the lattice panels:

library(FLCore)
# Loading required package: lattice
# Loading required package: iterators
# FLCore (Version 2.6.12, packaged: 2019-01-22 16:23:11 UTC)
data(ple4)
plot(ple4)

plot(propagate(ple4, 10))

It is fixed if replaced by:

do.call(xyplot, c(list(x=data ~ year|panel, data=obj, panel=pfun,
      groups=expression(qname), options = options), options))