Merge branch 'nil-bio-emojis' into 'develop'

add nil clause for Formatter.get_emoji/1 to return an empty result

Closes #274

See merge request pleroma/pleroma!315

lib/pleroma/formatter.ex

@@ -158,10 +158,12 @@ defmodule Pleroma.Formatter do
     end)
   end
 
-  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