call finished exceptions in normal operation any longer; i.e. we only
test for the connection at the begin of a command. This allows return
values, e.g. for commands like capisuite.fax_receive() which were
interrupted by an exception always in former CapiSuite versions and thus
never returned. This is also a better and more logical use of exceptions
IMO. ATTN: this is *far from stable*
git-svn-id: https://svn.ibp.de/svn/capisuite/trunk/capisuite@176 4ebea2bb-67d4-0310-8558-a5799e421b66
gernot