💡 Improve `DioException.requestOptions` explanation when it's empty #598

Job	Run time
Check formatting (dio)	11s
Check formatting (example)	10s
Check formatting (example_flutter_app)	9s
Check formatting (plugins/cookie_manager)	10s
Check formatting (plugins/http2_adapter)	11s
Check formatting (plugins/native_dio_adapter)	37s
Analyze Flutter libraries (example_flutter_app)	26s
Analyze Flutter libraries (plugins/native_dio_adapter)	29s
Analyze Dart-only libraries (dio)	19s
Analyze Dart-only libraries (example)	19s
Analyze Dart-only libraries (plugins/cookie_manager)	15s
Analyze Dart-only libraries (plugins/http2_adapter)	17s
Run unit tests with Flutter plugins (min, plugins/native_dio_adapter)	51s
Run unit tests with Flutter plugins (stable, plugins/native_dio_adapter)	34s
Run unit tests with Flutter plugins (beta, plugins/native_dio_adapter)	35s
Run unit tests with plugins (2.15.0, plugins/cookie_manager)	27s
Run unit tests with plugins (2.15.0, plugins/http2_adapter)	1m 2s
Run unit tests with plugins (stable, plugins/cookie_manager)	31s
Run unit tests with plugins (stable, plugins/http2_adapter)	1m 10s
Run unit tests with plugins (beta, plugins/cookie_manager)	28s
Run unit tests with plugins (beta, plugins/http2_adapter)	1m 9s
Run unit tests with dio (2.15.0, vm)	1m 11s
Run unit tests with dio (2.15.0, chrome)	3m 6s
Run unit tests with dio (stable, vm)	1m 8s
Run unit tests with dio (stable, chrome)	3m 28s
Run unit tests with dio (beta, vm)	1m 12s
Run unit tests with dio (beta, chrome)	2m 51s
	23m 16s

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