rescue MatchError in :int calls

Fixes #455

apps/elixir_ls_debugger/lib/debugger/server.ex

@@ -341,23 +341,38 @@ defmodule ElixirLS.Debugger.Server do
     pid = state.threads[thread_id]
     state = remove_paused_process(state, pid)
 
-    :int.next(pid)
+    try do
+      :int.next(pid)
+    rescue
+      e in MatchError ->
+        IO.warn ":int.next failed, #{Exception.message(e)}"
+    end
     {%{}, state}
   end
 
   defp handle_request(step_in_req(_, thread_id), state) do
     pid = state.threads[thread_id]
     state = remove_paused_process(state, pid)
 
-    :int.step(pid)
+    try do
+      :int.step(pid)
+    rescue
+      e in MatchError ->
+        IO.warn ":int.step failed, #{Exception.message(e)}"
+    end
     {%{}, state}
   end
 
   defp handle_request(step_out_req(_, thread_id), state) do
     pid = state.threads[thread_id]
     state = remove_paused_process(state, pid)
 
-    :int.finish(pid)
+    try do
+      :int.finish(pid)
+    rescue
+      e in MatchError ->
+        IO.warn ":int.finish failed, #{Exception.message(e)}"
+    end
     {%{}, state}
   end