Revert "Allow a console command to give blank arguments ("") without the parser failing, e.g. login text """

This reverts commit 129cc49eb4.
It was causing the "alert" console command to fail.

OpenSim/Framework/Console/CommandConsole.cs

@@ -433,10 +433,6 @@ namespace OpenSim.Framework.Console
 
             foreach (string s in cmd)
             {
-                // If a user puts an empty string on the console then this cannot be part of the command.
-                if (s == "")
-                    break;
-
                 index++;
 
                 List<string> found = new List<string>();
@@ -447,8 +443,9 @@ namespace OpenSim.Framework.Console
                     {
                         found.Clear();
                         found.Add(opt);
+                        break;
                     }
-                    else if (opt.StartsWith(s))
+                    if (opt.StartsWith(s))
                     {
                         found.Add(opt);
                     }