ikiwiki/doc/todo/Silence_monotone_warning.mdwn

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A quick [[patch]] to silence a [[rcs/monotone]] warning I started seeing:
diff --git a/IkiWiki/Plugin/monotone.pm b/IkiWiki/Plugin/monotone.pm
index 4b9be31..9d4e280 100644
--- a/IkiWiki/Plugin/monotone.pm
+++ b/IkiWiki/Plugin/monotone.pm
@@ -55,7 +55,7 @@ sub checkconfig () { #{{{
error("Monotone version too old, is $version but required 0.38");
}
- if (length $config{mtn_wrapper}) {
+ if (defined $config{mtn_wrapper} && length $config{mtn_wrapper}) {
push @{$config{wrappers}}, {
wrapper => $config{mtn_wrapper},
wrappermode => (defined $config{mtn_wrappermode} ? $config{mtn_wrappermode} : "06755"),