fix(telemetry): do not crash if bridge app is not ready yet

apps/emqx_bridge/src/emqx_bridge.erl

@@ -431,6 +431,8 @@ if_only_to_toggle_enable(OldConf, Conf) ->
                   }
            } when BridgeType :: atom().
 get_basic_usage_info() ->
+    InitialAcc = #{num_bridges => 0, count_by_type => #{}},
+    try
         lists:foldl(
           fun(#{resource_data := #{config := #{enable := false}}}, Acc) ->
                   Acc;
@@ -446,8 +448,13 @@ get_basic_usage_info() ->
                       , count_by_type => CountByType
                       }
           end,
-      #{num_bridges => 0, count_by_type => #{}},
-      list()).
+          InitialAcc,
+          list())
+    catch
+        %% for instance, when the bridge app is not ready yet.
+        _:_ ->
+            InitialAcc
+    end.
 
 bin(Bin) when is_binary(Bin) -> Bin;
 bin(Str) when is_list(Str) -> list_to_binary(Str);