[gnunet-scheme] 175/324: mq/handler: Handle the case where no handler exists.

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maxime-devos pushed a commit to branch master
in repository gnunet-scheme.

commit 9ef0449481dc02aaa853b09b5af1a7d940c08996
Author: Maxime Devos <maximedevos@telenet.be>
AuthorDate: Fri Aug 13 16:17:23 2021 +0200

    mq/handler: Handle the case where no handler exists.
    
    * gnu/gnunet/mq/handler.scm
      (message-handler-for): When 'vector-index' returns #false,
      don't attempt 'vector-ref'.
---
 gnu/gnunet/mq/handler.scm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gnu/gnunet/mq/handler.scm b/gnu/gnunet/mq/handler.scm
index 8c142f2..ed4c4d0 100644
--- a/gnu/gnunet/mq/handler.scm
+++ b/gnu/gnunet/mq/handler.scm
@@ -114,4 +114,4 @@ handler is found, return @code{#f} instead."
              (vector-index (lambda (handler)
                              (= index (message-handler-index handler)))
                            handlers)))
-       (vector-ref handlers handler-index)))))
+       (and handler-index (vector-ref handlers handler-index))))))

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