java: do not die when crashfn is None

Signed-off-by: Michal Toman <mtoman@redhat.com>
java: allow underscore in function name

Signed-off-by: Michal Toman <mtoman@redhat.com>
python: do not die on 'calling callback function'

Signed-off-by: Michal Toman <mtoman@redhat.com>
koops: do not die when modules are missing

Signed-off-by: Michal Toman <mtoman@redhat.com>
match_unknown_packages: add missing argument

Signed-off-by: Michal Toman <mtoman@redhat.com>
match_unknown_packages: coding style

Signed-off-by: Michal Toman <mtoman@redhat.com>