fix(gui): metadata generation

Description

This caused failed parsing of the metadata.xml in proxygui_idp.

How to test

See https://perunaai.atlassian.net/wiki/spaces/DEVS/pages/162070538/How+to+test+modifications+to+proxy

Author's checklist

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• This MR has been tested or does not change functionality
• I have added relevant merge request dependencies (if this MR has any)
• I have added the correct labels
• I have assigned reviewers (if any are relevant)
• I have edited the documentation (if the changes require it) or I have noted the need for the change if I do not have access to the documentation
• I have marked all introduced BREAKING CHANGES or necessary DEPLOYMENT NOTES in the commit message(s)

Reviewer's checklist

• This MR has been tested or does not change functionality
• This MR has correct commit message format

Other information

None

Related issues

re STR-1277

www/getSpMetadataXML.php

@@ -15,6 +15,7 @@ foreach ($metadata as $entityId => $metaArray20) {
     $metaArray20['metadata-set'] = 'saml20-sp-remote';
     if (empty($metaArray20['AssertionConsumerService'])) {
         Logger::warning('Skipping XML metadata generation for SP ' . $entityId . ' without ACS');
+        continue;
     }
     $metaBuilder = new SAMLBuilder($entityId);
     $metaBuilder->addMetadataSP20($metaArray20);