From 9d1a659bc720c8cbe3640b4c7aa5fce08c4315d2 Mon Sep 17 00:00:00 2001
From: dearblue <dearblue@users.osdn.me>
Date: Sat, 6 Feb 2021 18:09:27 +0900
Subject: Ignore if `conf.enable_test` does not exist

Because if the configuration file didn't contain any `conf.enable_test`, `rake test` would report an exception and exit.

```console
% cat my_config.rb
MRuby::Build.new { toolchain }

% rake MRUBY_CONFIG=my_config.rb test

  ...SNIP...

rake aborted!
NoMethodError: undefined method `invoke' for nil:NilClass
/var/tmp/mruby/tasks/test.rake:24:in `block (3 levels) in <top (required)>'
Tasks: TOP => test => test:build => test:build:lib
(See full trace by running task with --trace)
```
---
 tasks/test.rake | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tasks/test.rake b/tasks/test.rake
index a18635cc6..7dda40e39 100644
--- a/tasks/test.rake
+++ b/tasks/test.rake
@@ -21,7 +21,8 @@ namespace :test do |test_ns|
     desc "build library tests"
     task :lib => :all do
       MRuby.each_target{|build| build.gem(core: 'mruby-test')}
-      test_build_ns["lib_without_loading_gem"].invoke
+      test = test_build_ns["lib_without_loading_gem"]
+      test.invoke if test
     end
   end
 
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