Fix the crash that occurs when adding a feed without an icon #950
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The commit ec05bdd introduced a regression where attempting to subscribe to a feed without a favicon will cause ReadYou to crash. The link to the icon should be set to null if one doesn't exist, just like it did before the commit.
I used the following feed to test this bug:
https://feeds.yle.fi/uutiset/v1/majorHeadlines/YLE_UUTISET.rss