fix print method

NEWS.md

@@ -1,5 +1,6 @@
 # AzureRMR 1.0.0.9000
 
+* Don't print empty fields for ARM objects.
 * Add optional `etag` field to resource object definition.
 * Fix `AzureToken` object to never have a `NULL` password field (important to allow devicecode refreshing).
 * Add `location` argument to `az_resource_group$create_resource` method, rather than hardcoding it to the resgroup location.

R/format.R

@@ -40,7 +40,7 @@ format_public_fields <- function(env, exclude=character(0))
     objconts <- sapply(objnames, function(n)
     {
         x <- get(n, env)
-        deparsed <- if(is_empty(x) || is.function(x) || x == "") # don't print empty fields
+        deparsed <- if(is_empty(x) || is.function(x)) # don't print empty fields
             return(NULL)
         else if(is.list(x))
             paste0("list(", paste(names(x), collapse=", "), ")")