Check fallback value more carefully when processing tokenack / cli command. Added sccp_false as a counterpart for sccp_true

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5179 43c1dc8c-776e-4df2-8ef1-6e829299be21
Check fallback, being empty when processing tokenack

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5180 43c1dc8c-776e-4df2-8ef1-6e829299be21