Merge pull request #1176 from m-muecke/fix/autolayer-msts-series-label

fix(autolayer.msts): label unnamed series with the object name

Author: robjhyndman

NEWS.md

@@ -1,6 +1,7 @@
 # forecast (development version)
 
 * `auto.arima()` now truncates `xreg` together with the series when `approximation = TRUE` and `truncate` is set, so model selection no longer fails.
+* `autolayer()` now labels an unnamed `msts` series with the name of the object instead of "NULL".
 * `autoplot.forecast()` no longer errors for cross-sectional regression models fitted without an intercept.
 * `bld.mbb.bootstrap()` no longer errors when `num = 1` and now validates that `num` is a positive integer.
 * `forecast.Arima()` now correctly passes `xreg` when `bootstrap = TRUE` (#1115).

R/ggplot.R

@@ -2174,7 +2174,7 @@ autolayer.msts <- function(object, series = NULL, ...) {
     class(object) <- c("mts", "ts", "matrix")
   } else {
     if (is.null(series)) {
-      series <- deparse1(substitute(series))
+      series <- deparse1(substitute(object))
     }
     class(object) <- "ts"
   }