Bug 29436: ES mappings not saved if zebra is configured

Bug 29436: ES mappings not saved if zebra is configured

The mappings must be editable even if ES is not turned on yet.

Using a separate array to store the errors as we are testing for $@ ||
@messages.

There is still something wrong that should be improve, but this patch
should be safe for backport.

Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>