Fix for a possible SIGSEGV generated during session initialization
while "please wait... (determining panic task)" is being displayed.
This was caused by a patch introduced in crash-7.0.8, and can only
happen when analyzing dumpfiles whose header does not contain the
requisite information to determine the panic task and the active
tasks do not have any crash-related traces in their kernel stacks.
It should be noted that the SIGSEGV can be avoided by entering
"--no_panic" on the crash command line.
(anderson@redhat.com)