SotBE S3: create free grunt at start if recall list is empty

This is in place of recalling the strongest unit for free.  The unit is
needed for the dialog to work.  It is not possible to come into S3 from
S1 with an empty recall list, but it is when going through S2.

data/campaigns/Son_Of_The_Black_Eye/scenarios/03_Toward_Mountains_of_Haag.cfg

@@ -116,13 +116,23 @@
         name=start
 
         [role]
-            type=Orcish Warlord, Orcish Slurbow, Direwolf Rider, Orcish Warrior, Orcish Crossbowman, Goblin Knight, Goblin Pillager, Orcish Grunt, Orcish Archer,Wolf Rider
+            type=Orcish Warlord, Orcish Slurbow, Direwolf Rider, Orcish Warrior, Orcish Crossbowman, Goblin Knight, Goblin Pillager, Orcish Grunt, Orcish Archer, Wolf Rider
             role=Helper
         [/role]
 
-        [recall]
-            role=Helper
-        [/recall]
+        [if]
+            [have_unit]
+                role=Helper
+            [/have_unit]
+            [then]
+                [recall]
+                    role=Helper
+                [/recall]
+            [/then]
+            [else]
+                {UNIT 1 (Orcish Grunt) 35 23 (role=Helper)}
+            [/else]
+        [/if]
 
         [message]
             speaker="Kapou'e"