Core/Packets: Fixed exceptions being incorrectly thrown when appending empty strings to packets

Closes #5486
Closes #5495

src/server/shared/Packets/ByteBuffer.cpp

@@ -1,22 +0,0 @@
-/*
- * Copyright (C) 2008-2012 TrinityCore <http://www.trinitycore.org/>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include "ByteBuffer.h"
-
-void ByteBufferException::PrintError() const
-{
-}

src/server/shared/Packets/ByteBuffer.h

@@ -178,14 +178,17 @@ class ByteBuffer
 
         ByteBuffer &operator<<(const std::string &value)
         {
-            append((uint8 const*)value.c_str(), value.length());
+            if (size_t len = value.length())
+                append((uint8 const*)value.c_str(), len);
             append((uint8)0);
             return *this;
         }
 
         ByteBuffer &operator<<(const char *str)
         {
-            append((uint8 const*)str, str ? strlen(str) : 0);
+            size_t len = 0;
+            if (str && (len = strlen(str)))
+                append((uint8 const*)str, len);
             append((uint8)0);
             return *this;
         }
@@ -372,11 +375,6 @@ class ByteBuffer
                 _storage.reserve(ressize);
         }
 
-        void append(const std::string& str)
-        {
-            append((uint8 const*)str.c_str(), str.size() + 1);
-        }
-
         void append(const char *src, size_t cnt)
         {
             return append((const uint8 *)src, cnt);