ThinCurr: Fix edge case bug in jumper construction with single edge jumper, fixes OpenFUSIONToolkit#331 (OpenFUSIONToolkit#333)

Bug introduced in 3db6ce3

Author: hansec

src/physics/thin_wall.F90

@@ -2764,7 +2764,7 @@ SUBROUTINE order_jumper_list(list_in,list_out,n)
     END IF
   END IF
 END DO
-IF(flag_list(i0)==1)THEN
+IF((flag_list(i0)==1).AND.(n>2))THEN
   list_out(n+1)=lloop_tmp(i0)
 ELSE
   list_out(n+1)=0