Merge pull request litedb-org#2476 from Pysis868/fix-exit-shell-send-etx

Fix crash in shell when using ctl+c

Author: JKamsker

LiteDB.Shell/Shell/InputCommand.cs

@@ -1,6 +1,5 @@
-using System;
+using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 
 namespace LiteDB.Shell
 {
@@ -24,7 +23,16 @@ public string ReadCommand()
             Console.ForegroundColor = ConsoleColor.White;
             Console.Write("> ");
 
-            var cmd = this.ReadLine().Trim();
+            var cmd = this.ReadLine();
+
+            if (cmd == null)
+            {
+                this.AutoExit = true;
+                this.Running = false;
+                return "";
+            }
+
+            cmd = cmd.Trim();
 
             // single line only for shell commands
             if (ShellProgram.GetCommand(cmd) == null)