Fixed issue with double spaces in command handling.

src/com/sk89q/minecraft/util/commands/CommandContext.java

@@ -41,7 +41,9 @@ public class CommandContext {
 
         int i = 1;
         for (; i < args.length; i++) {
-            if (args[i].charAt(0) == '-' && args[i].matches("^-[a-zA-Z]+$")) {
+            if (args[i].length() == 0) {
+                // Ignore this
+            } else if (args[i].charAt(0) == '-' && args[i].matches("^-[a-zA-Z]+$")) {
                 for (int k = 1; k < args[i].length(); k++) {
                     flags.add(args[i].charAt(k));
                 }