Fix a bug occurs when no nearby pokestops found.

diff --git a/PokemonGo/RocketAPI/Window/MainForm.cs b/PokemonGo/RocketAPI/Window/MainForm.cs
index f1be82a..467f14b 100644
--- a/PokemonGo/RocketAPI/Window/MainForm.cs
+++ b/PokemonGo/RocketAPI/Window/MainForm.cs
@@ -575,6 +575,11 @@ namespace PokemonGo.RocketAPI.Window
             var mapObjects = await client.GetMapObjects();

             FortData[] rawPokeStops = mapObjects.MapCells.SelectMany(i => i.Forts).Where(i => i.Type == FortType.Checkpoint && i.CooldownCompleteTimestampMs < DateTime.UtcNow.ToUnixTime()).ToArray();
+            if (rawPokeStops == null || rawPokeStops.Count() <= 0)
+            {
+                ColoredConsoleWrite(Color.Red, $"No PokeStops to visit here, please stop the bot and change your location.");
+                return;
+            }
             pokeStops = rawPokeStops;
             UpdateMap();
             ColoredConsoleWrite(Color.Cyan, $"Finding fastest route through all PokeStops..");
diff --git a/PokemonGo/RocketAPI/Window/Properties/AssemblyInfo.cs b/PokemonGo/RocketAPI/Window/Properties/AssemblyInfo.cs
index a361a38..d86954f 100644
--- a/PokemonGo/RocketAPI/Window/Properties/AssemblyInfo.cs
+++ b/PokemonGo/RocketAPI/Window/Properties/AssemblyInfo.cs
@@ -32,5 +32,5 @@ using System.Runtime.InteropServices;
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.7.2.2")]
+[assembly: AssemblyVersion("1.7.2.3")]
 [assembly: AssemblyFileVersion("1.0.0.0")]