Enable house vehicles to be respawned with "/v respawn"

Fixes #791

Author: RussellLVP

javascript/features/vehicles/vehicle_commands.js

@@ -431,12 +431,6 @@ class VehicleCommands {
             return;
         }
 
-        // Bail out if the |subject| is not driving a vehicle, or it's not managed by this system.
-        if (!this.manager_.isManagedVehicle(vehicle)) {
-            player.sendMessage(Message.VEHICLE_NOT_DRIVING, subject.name);
-            return;
-        }
-
         this.manager_.respawnVehicle(vehicle);
 
         player.sendMessage(Message.VEHICLE_RESPAWNED, vehicle.model.name);

javascript/features/vehicles/vehicle_manager.js

@@ -290,10 +290,7 @@ class VehicleManager {
     // vehicle will be reset prior to the actual respawn.
     respawnVehicle(vehicle) {
         const result = this.findStreamableVehicle(vehicle);
-        if (!result)
-            throw new Error(`Unable to respawn vehicles not managed by the Vehicle Manager.`);
-        
-        // Recursively respawn the vehicle and all trailers attached.
+
         while (vehicle) {
             const trailer = vehicle.trailer;
 
@@ -302,7 +299,7 @@ class VehicleManager {
         }
 
         // If the |vehicle| was an ephemeral vehicle, delete it from the server.
-        if (result.type === VehicleManager.kTypeEphemeral)
+        if (result && result.type === VehicleManager.kTypeEphemeral)
             this.streamer_().deleteVehicle(result.streamableVehicle);
     }