emblemed-icon: allow passing a NULL emblem to g_emblemed_icon_new()
emblemed-icon: allow passing a NULL emblem to g_emblemed_icon_new()

So that if we already have a list of emblems we know we want to add to
the icon, we can use e.g. a for loop to add them all, without picking
the first and looping from the second.

https://bugzilla.gnome.org/show_bug.cgi?id=634504

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