Tibble problems in heatmap routine

[nhejazi]

Since a5482f5, the object in slot tmleOut was changed so as to be wrapped in as_tibble, which coerces it to multiple classes: tbl_df, tbl, data.frame. Upon invoking heatmap_ic, this results in the following warning:

Warning message:
In if (class(x@tmleOut) == "EList") { :
  the condition has length > 1 and only the first element will be used