X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~yarrgweb/git?a=blobdiff_plain;f=yarrg%2Fwhere-vessels;h=272a11432b37f6c6d7169f773b89a621790e7326;hb=3ece24832da57c70c4ca1c745d6dd79227447322;hp=9b8c7728a41ade97694f961749ba0d4b20ff3f64;hpb=d08aa8fd6412ed025a8d2afcbdc36c098b019da4;p=ypp-sc-tools.web-live.git

diff --git a/yarrg/where-vessels b/yarrg/where-vessels
index 9b8c772..272a114 100755
--- a/yarrg/where-vessels
+++ b/yarrg/where-vessels
@@ -133,6 +133,9 @@ proc argdefaults {} {
 	if {[info exists ocean]} { lappend cmd --ocean $ocean }
 	if {[info exists pirate]} { lappend cmd --pirate $pirate }
 	manyset [split [eval exec $cmd] " "] ocean pirate
+	if {![llength $ocean] || ![llength $pirate]} {
+	    error "$ocean $pirate ?"
+	}
     }
     lappend scraper $ocean
 }