NPE when server started offline.

[Cazzar]

If the server is not having an active internet connection at startup, it will throw socket errors about the socket being.
we need to catch this error and reinit the socket.

shokoserver      | 02:20:20| --- AniDB_File record not found
shokoserver      | 02:20:20| --- Getting AniDB_File record from AniDB....
shokoserver      | 02:20:20| --- udp command: AUTH user=******&pass=******&protover=3&client=ommserver&clientver=2&comp=1
shokoserver      | 02:20:20| --- Time since last request is 2220 ms, throttling for 2500.
shokoserver      | 02:20:22| --- Sending AniDB command.
shokoserver      | 02:20:22| --- System.ArgumentNullException: Value cannot be null.
shokoserver      | Parameter name: remoteEP
shokoserver      |   at System.Net.Sockets.Socket.SendTo (System.Byte[] buffer, System.Int32 offset, System.Int32 size, System.Net.Sockets.SocketFlags socketFlags, System.Net.EndPoint remoteEP) [0x0001a] in <50d80b08c1a5449282b22aedf03ce925>:0
shokoserver      |   at System.Net.Sockets.Socket.SendTo (System.Byte[] buffer, System.Net.EndPoint remoteEP) [0x00000] in <50d80b08c1a5449282b22aedf03ce925>:0
shokoserver      |   at AniDBAPI.Commands.AniDBUDPCommand.ProcessCommand (System.Net.Sockets.Socket& soUDP, System.Net.IPEndPoint& remoteIpEndPoint, System.String sessionID, System.Text.Encoding enc) [0x001b4] in /usr/src/app/source/Shoko.Server/AniDB_API/Commands/AniDBUDPCommand.cs:108
shokoserver      | 02:20:22| --- System.ArgumentNullException: Value cannot be null.
shokoserver      | Parameter name: remoteEP
shokoserver      |   at System.Net.Sockets.Socket.ReceiveFrom (System.Byte[] buffer, System.Int32 offset, System.Int32 size, System.Net.Sockets.SocketFlags socketFlags, System.Net.EndPoint& remoteEP) [0x0001b] in <50d80b08c1a5449282b22aedf03ce925>:0
shokoserver      |   at System.Net.Sockets.Socket.ReceiveFrom (System.Byte[] buffer, System.Net.EndPoint& remoteEP) [0x00000] in <50d80b08c1a5449282b22aedf03ce925>:0
shokoserver      |   at AniDBAPI.Commands.AniDBUDPCommand.ProcessCommand (System.Net.Sockets.Socket& soUDP, System.Net.IPEndPoint& remoteIpEndPoint, System.String sessionID, System.Text.Encoding enc) [0x001f0] in /usr/src/app/source/Shoko.Server/AniDB_API/Commands/AniDBUDPCommand.cs:126
shokoserver      | 02:20:22| --- error in login: System.ArgumentNullException: Value cannot be null.
shokoserver      | Parameter name: remoteEP
shokoserver      |   at System.Net.Sockets.Socket.ReceiveFrom (System.Byte[] buffer, System.Int32 offset, System.Int32 size, System.Net.Sockets.SocketFlags socketFlags, System.Net.EndPoint& remoteEP) [0x0001b] in <50d80b08c1a5449282b22aedf03ce925>:0
shokoserver      |   at System.Net.Sockets.Socket.ReceiveFrom (System.Byte[] buffer, System.Net.EndPoint& remoteEP) [0x00000] in <50d80b08c1a5449282b22aedf03ce925>:0
shokoserver      |   at AniDBAPI.Commands.AniDBUDPCommand.ProcessCommand (System.Net.Sockets.Socket& soUDP, System.Net.IPEndPoint& remoteIpEndPoint, System.String sessionID, System.Text.Encoding enc) [0x001f0] in /usr/src/app/source/Shoko.Server/AniDB_API/Commands/AniDBUDPCommand.cs:126
shokoserver      | 02:20:24| --- AniDB Login Failed: error connecting to AniDB: System.ArgumentNullException: Value cannot be null.
shokoserver      | Parameter name: remoteEP
shokoserver      |   at System.Net.Sockets.Socket.ReceiveFrom (System.Byte[] buffer, System.Int32 offset, System.Int32 size, System.Net.Sockets.SocketFlags socketFlags, System.Net.EndPoint& remoteEP) [0x0001b] in <50d80b08c1a5449282b22aedf03ce925>:0
shokoserver      |   at System.Net.Sockets.Socket.ReceiveFrom (System.Byte[] buffer, System.Net.EndPoint& remoteEP) [0x00000] in <50d80b08c1a5449282b22aedf03ce925>:0
shokoserver      |   at AniDBAPI.Commands.AniDBUDPCommand.ProcessCommand (System.Net.Sockets.Socket& soUDP, System.Net.IPEndPoint& remoteIpEndPoint, System.String sessionID, System.Text.Encoding enc) [0x001f0] in /usr/src/app/source/Shoko.Server/AniDB_API/Commands/AniDBUDPCommand.cs:126