Fixed SIOOBE when entering a blank quoted string

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

@@ -64,7 +64,7 @@ public class CommandContext {
         List<String> argList = new ArrayList<String>(args.length);
         for (int i = 1; i < args.length; ++i) {
             String arg = args[i];
-            if (arg.isEmpty()) {
+            if (arg.length() == 0) {
                 continue;
             }
 
@@ -94,6 +94,11 @@ public class CommandContext {
                     arg = build.toString();
                     i = endIndex;
                 }
+
+                // In case there is an empty quoted string
+                if (arg.length() == 0) {
+                    continue;
+                }
                 // else raise exception about hanging quotes?
             }
             argList.add(arg);

src/main/java/com/sk89q/wepif/PermissionsResolverManager.java

@@ -241,8 +241,8 @@ public class PermissionsResolverManager implements PermissionsResolver {
         }
 
         if (keys.contains("dinner-perms") || keys.contains("dinnerperms")) {
-            config.setProperty("dinner-perms", null);
-            config.setProperty("dinnerperms", null);
+            config.removeProperty("dinner-perms");
+            config.removeProperty("dinnerperms");
             isUpdated = true;
         }
         if (!keys.contains("permissions")) {

src/test/java/com/sk89q/minecraft/util/commands/CommandContextTest.java

@@ -143,4 +143,15 @@ public class CommandContextTest {
             fail("Error creating CommandContext");
         }
     }
+
+    @Test
+    public void testEmptyQuote() {
+        try {
+            CommandContext context = new CommandContext("region flag xmas blocked-cmds \"\"");
+            assertEquals(context.argsLength(), 3);
+        } catch (CommandException e) {
+            e.printStackTrace();
+            fail("Error creating CommandContext");
+        }
+    }
 }