Empty query map in OptionsBuilder throws RangeError

[jaween]

When constructing a client with an empty query, an error is thrown.

Code sample:

final client = io(
      'http://example.com',
      OptionBuilder()
          .setTimeout(1500)
          .setTransports(['websocket'])
          .setQuery({})
          .enableForceNew()
          .build(),
    );

Notice that the query is set to {} (this happens for me when I have a conditional entry in the map).

The error that is thrown is:

[VERBOSE-2:dart_vm_initializer.cc(41)] Unhandled Exception: RangeError (index): Invalid value: Only valid value is 0: 1
#0      List.[] (dart:core-patch/growable_array.dart:264:36)
#1      decode
parseqs.dart:35
#2      new Socket
socket.dart:100
#3      Manager.connect
manager.dart:147
#4      Manager.open
manager.dart:140
#5      Manager.reconnect.<anonymous closure>
manager.dart:411
#6      Timer._createTimer.<anonymous closure> (dart:async-patch/timer_patch.dart:18:15)
#7      _Timer._runTimers (dart:isolate-patch/timer_impl.dart:398:19)
#8      _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:429:5)
#9      _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:189:12)