sloop around get_emoji/1 to check is_binary and have a fallthrough

default that returns empty

lib/pleroma/formatter.ex

@@ -157,12 +157,12 @@ def emojify(text, emoji) do
     end)
   end
 
-  def get_emoji(nil), do: []
-
-  def get_emoji(text) do
+  def get_emoji(text) when is_binary(text) do
     Enum.filter(@emoji, fn {emoji, _} -> String.contains?(text, ":#{emoji}:") end)
   end
 
+  def get_emoji(_), do: []
+
   def get_custom_emoji() do
     @emoji
   end