Call end_of_candidates on receiving an empty ICE candidate (#68)

Author: mickel8

lib/ex_webrtc/peer_connection.ex

@@ -391,6 +391,12 @@ defmodule ExWebRTC.PeerConnection do
     {:reply, {:error, :no_remote_description}, state}
   end
 
+  @impl true
+  def handle_call({:add_ice_candidate, %{candidate: ""}}, _from, state) do
+    :ok = state.ice_transport.end_of_candidates(state.ice_pid)
+    {:reply, :ok, state}
+  end
+
   @impl true
   def handle_call({:add_ice_candidate, candidate}, _from, state) do
     with "candidate:" <> attr <- candidate.candidate do