iscmd: supplement -x with -d test not a dir

src/filters/rclscribus

@@ -23,6 +23,7 @@ filetype=Scribus
 
 
 
+
 #RECFILTCOMMONCODE
 ##############################################################################
 # !! Leave the previous line unmodified!! Code imported from the
@@ -46,10 +47,10 @@ iscmd()
     cmd=$1
     case $cmd in
     */*)
-	if test -x $cmd ; then return 0; else return 1; fi ;;
+	if test -x $cmd -a ! -d $cmd ; then return 0; else return 1; fi ;;
     *)
       oldifs=$IFS; IFS=":"; set -- $PATH; IFS=$oldifs
-      for d in $*;do test -x $d/$cmd && return 0;done
+      for d in $*;do test -x $d/$cmd -a ! -d $d/$cmd && return 0;done
       return 1 ;;
     esac
 }