Prevent profiles with GUID.Empty as ID

Vocaluxe/Base/CProfiles.cs

@@ -357,7 +357,7 @@ namespace Vocaluxe.Base
 
         public static bool IsProfileIDValid(Guid profileID)
         {
-            return _Profiles.ContainsKey(profileID);
+            return profileID != Guid.Empty && _Profiles.ContainsKey(profileID);
         }
 
         public static bool IsAvatarIDValid(int avatarID)

Vocaluxe/Base/Server/CWebservice.cs

@@ -90,7 +90,7 @@ namespace Vocaluxe.Base.Server
         {
             Guid sessionKey = _GetSession();
 
-            if (profile.ProfileId != Guid.Empty) //-1 is the id for a new profile
+            if (profile.ProfileId != Guid.Empty) //Guid.Empty is the id for a new profile
             {
                 if (CSessionControl.GetUserIdFromSession(sessionKey) != profile.ProfileId
                     && !(_CheckRight(EUserRights.EditAllProfiles)))