Johan Dobbelstein 5b39bf184d MDL-66582 auth: Fix empty auth_logo in CAS/Shibboleth auth plugins
* set $idp['iconurl'] = null if no auth_logo
* lib/templates/loginform.mustache will skip NULL iconurls
* lib/ajax/service?info=tool_mobile_get_public_config will validate the NULL values
2019-10-31 12:03:39 +01:00
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