Avoid fatal error on the community page

[annando]

This should fix this fatal error:

[Sun Sep 20 19:23:19.574692 2020] [php7:error] [pid 25996] [client 192.168.102.50:52726] PHP Fatal error:  
Uncaught TypeError: Argument 1 passed to Friendica\\Model\\Contact::getByURL() must be of the type string, null given, called in /var/www/html/src/Model/Contact.php on line 2518 and defined in /var/www/html/src/Model/Contact.php:207
Stack trace:
#0 /var/www/html/src/Model/Contact.php(2518): Friendica\\Model\\Contact::getByURL(NULL, false)
#1 /var/www/html/src/Object/Post.php(985): Friendica\\Model\\Contact::magicLink(NULL)
#2 /var/www/html/src/Object/Post.php(286): Friendica\\Object\\Post->checkWallToWall()
#3 /var/www/html/src/Object/Thread.php(207): Friendica\\Object\\Post->getTemplateData(Array)
#4 /var/www/html/include/conversation.php(679): Friendica\\Object\\Thread->getTemplateData(Array)
#5 /var/www/html/src/Module/Conversation/Community.php(104): conversation(Object(Friendica\\App), Array, 'community', false, false, 'commented', 1)
#6 [internal function]: Friendica\\Module\\Conversation\\Community::content(Array)
#7 /var/www/html/src/App/Page.php(331): call_user_func(Array, Array)
#8 /var/www/html/src/App/Page.php(38 in /var/www/html/src/Model/Contact.php on line 207, referer: https://f.nospy.net/display/ec054ce7-845f-6780-1213-61e875841323

See here: https://forum.friendi.ca/73b2629d-695f-6790-afd6-62c731724465

[tobiasd]

You say when you are ready?

[annando]

Should be done now.