- Fix: wrong final destination displayed for travelling militia

- Fix: when ordering militia movement, data of another group's path can be erased
- Fix: a militia groups's path isn't always destroyed if the group is deleted
- Fix: unsafe pointer handling can result in a gamecrash when loading strategic AI data from a savegame
- Fix: traveltime calculations do not correctly handle waypoints, resulting in possible crashes

git-svn-id: https://ja2svn.mooo.com/source/ja2/trunk/GameSource/ja2_v1.13/Build@7876 3b4a5df2-a311-0410-b5c6-a8a6f20db521

Strategic/Strategic AI.cpp

@@ -2295,7 +2295,7 @@ DebugMsg (TOPIC_JA2,DBG_LEVEL_3,"Strategic5");
 				SetThisSectorAsEnemyControlled( pGroup->ubSectorX, pGroup->ubSectorY, 0, TRUE );
 				RemovePGroup( pGroup );
 				RecalculateGarrisonWeight( i );
-
+				
 				return TRUE;
 			}
 		}
@@ -4198,8 +4198,15 @@ BOOLEAN LoadStrategicAI( HWFILE hFile )
 						pGroup->ubSectorY != gWorldSectorY ||
 						gbWorldSectorZ )
 				{
+					UINT8 groupid = pGroup->ubGroupID;
+
 					RepollSAIGroup( pGroup );
-					ValidateGroup( pGroup );
+
+					// it is possible that the group gets destroyed inbetween, so recheck on that
+					pGroup = GetGroup( groupid );
+
+					if ( pGroup )
+						ValidateGroup( pGroup );
 				}
 			}
 		}