Bug 15068: Get rid of warnings in members/summary-print.pl

Bug 15068: Get rid of warnings in members/summary-print.pl

This patch removes warnings when printing a summary from a member's
detail page, like:

- use of uninitialized value in sprintf
  at /usr/share/kohaclone/members/summary-print.pl line 47

- Use of uninitialized value $roadtype in concatenation (.) or string
  at /usr/share/kohaclone/members/summary-print.pl line 61

- Use of uninitialized value in addition (+)
  at /usr/share/kohaclone/members/summary-print.pl line 87

- Argument "2015-11-03 23:59:00" isn't numeric in numeric comparison
  (<=>) at /usr/share/kohaclone/members/summary-print.pl line 103

To test:
- Apply patch
- Go to a detail page with a member who has a lot of fines
- Print summary
- Verify that warnings like the ones above do no longer appear.

Signed-off-by: Frederic Demians <f.demians@tamil.fr>
  Have been able to see those warnings in Apache log file, and notice
  their disappearance after applying this patch.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>