don't strip -- Pkg.pkg_server doesn't

Author: mortenpi

src/PkgAuthentication.jl

@@ -23,7 +23,7 @@ abstract type Failure <: State end
 ## authentication state machine
 
 function _assert_pkg_server_env_var_is_set()
-    if isempty(strip(get(ENV, pkg_server_env_var_name, "")))
+    if isempty(get(ENV, pkg_server_env_var_name, ""))
         msg = "The `$(pkg_server_env_var_name)` environment variable must be set and non-empty"
         throw(ErrorException(msg))
     end