Fix a small issue with None-type input on span name (#35)

*Issue #, if available:*
If input a None type of span name, it will trigger an exception
*Description of changes:*
add a validate step to handle none type span name

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Author: XinRanZhAWS

aws-opentelemetry-distro/src/amazon/opentelemetry/distro/_aws_span_processing_util.py

@@ -102,7 +102,7 @@ def _is_sqs_receive_message_consumer_span(span: ReadableSpan) -> bool:
     instrumentation_scope: InstrumentationScope = span.instrumentation_scope
 
     return (
-        _SQS_RECEIVE_MESSAGE_SPAN_NAME.casefold() == span.name.casefold()
+        (span.name is not None and _SQS_RECEIVE_MESSAGE_SPAN_NAME.casefold() == span.name.casefold())
         and SpanKind.CONSUMER == span.kind
         and instrumentation_scope is not None
         and instrumentation_scope.name.startswith(_AWS_SDK_INSTRUMENTATION_SCOPE_PREFIX)