bug #3254: error handling in onetemplate instantiate

src/cli/onetemplate

@@ -196,7 +196,12 @@ cmd=CommandParser::CmdParser.new(ARGV) do
                 on_hold = options[:hold] != nil
 
                 extra_template = ""
-                t.info
+                rc = t.info
+
+                if OpenNebula.is_error?(rc)
+                    STDERR.puts rc.message
+                    exit(-1)
+                end
 
                 if args[1]
                     extra_template = File.read(args[1])