better handling of bangtag-only posts that produce no output

app/controllers/api/v1/statuses_controller.rb

@@ -58,7 +58,11 @@ class Api::V1::StatusesController < Api::BaseController
                                          content_type: status_params[:content_type],
                                          idempotency: request.headers['Idempotency-Key'])
 
-    render json: @status, serializer: @status.is_a?(ScheduledStatus) ? REST::ScheduledStatusSerializer : REST::StatusSerializer
+    if @status.nil?
+      raise Mastodon::ValidationError, 'Bangtags processed. No output.'
+    else
+      render json: @status, serializer: @status.is_a?(ScheduledStatus) ? REST::ScheduledStatusSerializer : REST::StatusSerializer
+    end
   end
 
   def destroy

app/lib/bangtags.rb

@@ -730,10 +730,14 @@ class Bangtags
 
     account.user.save
 
-    status.text = @chunks.join
-    status.save
-
-    postprocess_after_save
+    text = @chunks.join
+    if text.blank?
+      RemoveStatusService.new.call(@status)
+    else
+      status.text = text
+      status.save
+      postprocess_after_save
+    end
   end
 
   private

app/services/post_status_service.rb

@@ -52,7 +52,7 @@ class PostStatusService < BaseService
     if scheduled?
       schedule_status!
     else
-      process_status!
+      return unless process_status!
       postprocess_status!
       bump_potential_friendship!
     end
@@ -148,8 +148,11 @@ class PostStatusService < BaseService
       @status = @account.statuses.create!(status_attributes)
     end
 
+    return false if @status.destroyed?
+
     process_hashtags_service.call(@status, @tags, @preloaded_tags)
     process_mentions_service.call(@status)
+    return true
   end
 
   def schedule_status!