(svn r25640) -Fix: Do not suggest a start date for the game when there will be no vehicles available at all.

src/engine.cpp

@@ -1112,12 +1112,16 @@ void CheckEngines()
 		if (!e->IsEnabled()) continue;
 
 		/* We have an available engine... yay! */
-		if (e->flags & ENGINE_AVAILABLE && e->company_avail != 0) return;
+		if ((e->flags & ENGINE_AVAILABLE) != 0 && e->company_avail != 0) return;
 
 		/* Okay, try to find the earliest date. */
 		min_date = min(min_date, e->info.base_intro);
 	}
 
-	SetDParam(0, min_date);
-	ShowErrorMessage(STR_ERROR_NO_VEHICLES_AVAILABLE_YET, STR_ERROR_NO_VEHICLES_AVAILABLE_YET_EXPLANATION, WL_WARNING);
+	if (min_date < INT32_MAX) {
+		SetDParam(0, min_date);
+		ShowErrorMessage(STR_ERROR_NO_VEHICLES_AVAILABLE_YET, STR_ERROR_NO_VEHICLES_AVAILABLE_YET_EXPLANATION, WL_WARNING);
+	} else {
+		ShowErrorMessage(STR_ERROR_NO_VEHICLES_AVAILABLE_AT_ALL, STR_ERROR_NO_VEHICLES_AVAILABLE_AT_ALL_EXPLANATION, WL_WARNING);
+	}
 }

src/lang/english.txt

@@ -4316,6 +4316,8 @@ STR_ERROR_CAN_T_CHANGE_SERVICING                                :{WHITE}Can't ch
 
 STR_ERROR_VEHICLE_IS_DESTROYED                                  :{WHITE}... vehicle is destroyed
 
+STR_ERROR_NO_VEHICLES_AVAILABLE_AT_ALL                          :{WHITE}No vehicles will be available at all
+STR_ERROR_NO_VEHICLES_AVAILABLE_AT_ALL_EXPLANATION              :{WHITE}Change your NewGRF configuration
 STR_ERROR_NO_VEHICLES_AVAILABLE_YET                             :{WHITE}No vehicles are available yet
 STR_ERROR_NO_VEHICLES_AVAILABLE_YET_EXPLANATION                 :{WHITE}Start a new game after {DATE_SHORT} or use a NewGRF that provides early vehicles