Not all countries have Zip codes or equivalent (#7064)

# Description & Issue number it closes 
<!-- Please include a summary of the changes and the related issue.
Please also include relevant motivation and context. -->

Not all countries have Zip codes or equivalent, so we can't force it as
a requirement.

Related to #7032

## Screenshots (if appropriate)
<!-- Before and after --> 

None.

## How to test the changes?

Manual testing.

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] This change requires a documentation update

# How Has This Been Tested?

<!-- Please describe the tests that you ran to verify your changes.
Provide instructions so we can reproduce. Please also list any relevant
details for your test configuration -->

Manual testing..

# Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

src/external/templates/registration/family-register.php

@@ -3,17 +3,16 @@
 use ChurchCRM\dto\SystemConfig;
 use ChurchCRM\dto\SystemURLs;
 
-// Set the page title and include HTML header
 $sPageTitle = gettext("Family Registration");
 require(SystemURLs::getDocumentRoot() . "/Include/HeaderNotLoggedIn.php");
 
-
 $headerHTML = '<b>Church</b>CRM';
 $sHeader = SystemConfig::getValue("sHeader");
 $sChurchName = SystemConfig::getValue("sChurchName");
+
 if (!empty($sHeader)) {
     $headerHTML = html_entity_decode($sHeader, ENT_QUOTES);
-} else if (!empty($sChurchName)) {
+} elseif (!empty($sChurchName)) {
     $headerHTML = $sChurchName;
 }
 
@@ -59,7 +58,7 @@
                 <div class="form-group has-feedback">
                     <div class="row">
                         <div class="col-lg-3">
-                            <input id="familyZip" name="familyZip" class="form-control" placeholder="<?= gettext('Zip') ?>" required value="<?= SystemConfig::getValue('sDefaultZip') ?>">
+                            <input id="familyZip" name="familyZip" class="form-control" placeholder="<?= gettext('Zip') ?>" value="<?= SystemConfig::getValue('sDefaultZip') ?>">
                         </div>
                         <div class="col-lg-9">
                             <select id="familyCountry" name="familyCountry" class="form-control select2" data-system-default="<?= SystemConfig::getValue('sDefaultCountry')?>">