Bug in RichConsoleSpanExporter

[trondhindenes]

Describe your environment
Python 3.9.7, Snippet from pipenv graph:

opentelemetry-exporter-richconsole==0.25b2
  - opentelemetry-api [required: ~=1.3, installed: 1.10a0]
  - opentelemetry-sdk [required: ~=1.3, installed: 1.10a0]
    - opentelemetry-api [required: ==1.10a0, installed: 1.10a0]
  - opentelemetry-semantic-conventions [required: ==0.25b2, installed: 0.25b2]
  - rich [required: >=10.0.0, installed: 10.12.0]
    - colorama [required: >=0.4.0,<0.5.0, installed: 0.4.4]
    - commonmark [required: >=0.9.0,<0.10.0, installed: 0.9.1]
    - pygments [required: >=2.6.0,<3.0.0, installed: 2.10.0]

Steps to reproduce
Given this code:

from opentelemetry import trace
from opentelemetry.sdk.resources import SERVICE_NAME, Resource
from opentelemetry.exporter.richconsole import RichConsoleSpanExporter
from opentelemetry.sdk.trace import TracerProvider
from opentelemetry.sdk.trace.export import BatchSpanProcessor
from opentelemetry.sdk.trace.export import ConsoleSpanExporter

APP_SERVICE_NAME = "fastapi-goofing"

trace.set_tracer_provider(
    TracerProvider(
        resource=Resource.create({SERVICE_NAME: APP_SERVICE_NAME})
    )
)

rich_console_exporter = RichConsoleSpanExporter(
    service_name=APP_SERVICE_NAME,
)


console_exporter = ConsoleSpanExporter(
    service_name=APP_SERVICE_NAME
)

trace.get_tracer_provider().add_span_processor(
    BatchSpanProcessor(rich_console_exporter)
    #BatchSpanProcessor(console_exporter)
)
tracer = trace.get_tracer(__name__)

with tracer.start_as_current_span("foo"):
    with tracer.start_as_current_span("bar"):
        with tracer.start_as_current_span("baz"):
            print("Hello world from OpenTelemetry Python!")

The RichConsoleSpanExporter throws this error:

Exception while exporting Span batch.
Traceback (most recent call last):
  File "/home/trond/Documents/projects/fastapi-goofring/.venv/lib/python3.9/site-packages/opentelemetry/sdk/trace/export/__init__.py", line 331, in _export_batch
    self.span_exporter.export(self.spans_list[:idx])  # type: ignore
  File "/home/trond/Documents/projects/fastapi-goofring/.venv/lib/python3.9/site-packages/opentelemetry/exporter/richconsole/__init__.py", line 166, in export
    child = parents[span.parent.span_id].add(
AttributeError: 'NoneType' object has no attribute 'span_id'

If I replace the Rich exporter with the regular Console exporter, everything runs nicely without problems

What is the expected behavior?
Code runs without exceptions

What is the actual behavior?
Exception is thrown

Additional context

[lzchen]

@tonybaloney fyi

[tonybaloney]

@tonybaloney fyi

Thanks for the report. Will fix today