Sentry.with_child_span didn't handle current scope is nil

[elct9620]

Issue Description

sentry-ruby/sentry-ruby/lib/sentry-ruby.rb

Lines 401 to 420 in 0fe8d27

	def with_child_span(**attributes, &block)
	current_span = get_current_scope.get_span
	if current_span
	result = nil
	begin
	current_span.with_child_span(**attributes) do |child_span|
	get_current_scope.set_span(child_span)
	result = yield(child_span)
	end
	ensure
	get_current_scope.set_span(current_span)
	end
	result
	else
	yield(nil)
	end
	end

The get_current_scope will return nil before initialized then the with_child_span will failed.

Reproduction Steps

require 'sentry-ruby'

# May raise exception if Sentry not ready
Sentry.with_child_span do |child_span|
  # ...
end

Expected Behavior

Ignore the span until Sentry is ready.

Actual Behavior

Raised UndefinedMethod error

Ruby Version

2.7.6

SDK Version

5.3.0

Integration and Its Version

Sequel

Sentry Config

No response

[st0012]

@elct9620 Thanks for reporting this 😄 I've added #1819 to address it.