fix(spec_cli): set the default column when there is no terminal

[amondnet]

close #19

If no terminal is attached to stdout, a StdoutException is thrown. Set the default columns when there is no terminal.

https://api.dart.dev/stable/2.16.1/dart-io/Stdout/terminalColumns.html
https://api.dart.dev/stable/2.16.1/dart-io/Stdout/hasTerminal.html

dart packages/spec_cli/bin/main.dart --ci > test.log 

Unhandled exception:
StdoutException: Could not get terminal size, OS Error: Inappropriate ioctl for device, errno = 25
#0      Stdout._terminalSize (dart:io-patch/stdio_patch.dart:145:7)
#1      Stdout._terminalColumns (dart:io-patch/stdio_patch.dart:138:35)
#2      Stdout.terminalColumns (dart:io/stdio.dart:205:30)
#3      BacktrackingRenderer.renderFrame (package:spec_cli/src/renderer.dart:141:31)
#4      spec.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:spec_cli/src/command_runner.dart:212:54)
#5      AsyncValueX.when.<anonymous closure> (package:riverpod/src/common.dart:498:24)
#6      AsyncData.map (package:riverpod/src/common.dart:273:16)
#7      AsyncValueX.when (package:riverpod/src/common.dart:497:12)
#8      spec.<anonymous closure>.<anonymous closure> (package:spec_cli/src/command_runner.dart:206:18)
#9      _rootRunBinary (dart:async/zone.dart:1450:47)
#10     _CustomZone.runBinary (dart:async/zone.dart:1342:19)
#11     _CustomZone.runBinaryGuarded (dart:async/zone.dart:1252:7)
#12     ProviderElementBase._notifyListeners.<anonymous closure> (package:riverpod/src/framework/provider_base.dart:557:24)
#13     ResultData.map (package:riverpod/src/framework/provider_base.dart:1130:16)
#14     ProviderElementBase._notifyListeners (package:riverpod/src/framework/provider_base.dart:554:14)
#15     ProviderElementBase._performBuild (package:riverpod/src/framework/provider_base.dart:447:7)
#16     ProviderElementBase.flush (package:riverpod/src/framework/provider_base.dart:415:7)
#17     _ProviderScheduler._performRefresh (package:riverpod/src/framework/scheduler.dart:55:41)
#18     _ProviderScheduler._task (package:riverpod/src/framework/scheduler.dart:41:5)
#19     new Future.<anonymous closure> (dart:async/future.dart:252:37)
#20     _rootRun (dart:async/zone.dart:1418:47)
#21     _CustomZone.run (dart:async/zone.dart:1328:19)
#22     _CustomZone.runGuarded (dart:async/zone.dart:1236:7)
#23     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1276:23)
#24     _rootRun (dart:async/zone.dart:1426:13)
#25     _CustomZone.run (dart:async/zone.dart:1328:19)
#26     _CustomZone.bindCallback.<anonymous closure> (dart:async/zone.dart:1260:23)
#27     Timer._createTimer.<anonymous closure> (dart:async-patch/timer_patch.dart:18:15)
#28     _Timer._runTimers (dart:isolate-patch/timer_impl.dart:395:19)
#29     _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:426:5)
#30     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:192:12)

close amondnet/oss#4