remove necessity to catch a KeyNotFoundException in BaseHttpServer.RemoveLLSDHandler()

OpenSim/Framework/Servers/HttpServer/BaseHttpServer.cs

@@ -1852,22 +1852,17 @@ namespace OpenSim.Framework.Servers.HttpServer
         }
 
         public bool RemoveLLSDHandler(string path, LLSDMethod handler)
-        {
-            try
         {
             lock (m_llsdHandlers)
             {
-                    if (handler == m_llsdHandlers[path])
+                LLSDMethod foundHandler;
+
+                if (m_llsdHandlers.TryGetValue(path, out foundHandler) && foundHandler == handler)
                 {
                     m_llsdHandlers.Remove(path);
                     return true;
                 }
             }
-            }
-            catch (KeyNotFoundException)
-            {
-                // This is an exception to prevent crashing because of invalid code
-            }
 
             return false;
         }