Fixed bug that caused callbacks for protocols with payload, to be called even for packets without payload


git-svn-id: https://svn.ntop.org/svn/ntop/trunk/nDPI@7327 a02cd0c1-8e76-42e1-a119-56f9641475e2
Minor fixes


git-svn-id: https://svn.ntop.org/svn/ntop/trunk/nDPI@7328 a02cd0c1-8e76-42e1-a119-56f9641475e2
Optimization


git-svn-id: https://svn.ntop.org/svn/ntop/trunk/nDPI@7329 a02cd0c1-8e76-42e1-a119-56f9641475e2