FIX: skip onceoff job for groups with invalid flair URL.

app/jobs/onceoff/migrate_group_flair_images.rb

@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+require 'uri'
 
 module Jobs
   class MigrateGroupFlairImages < ::Jobs::Onceoff
@@ -12,6 +13,8 @@ module Jobs
         end
 
         old_url = group[:flair_url]
+        next if old_url.blank? || old_url !~ URI::regexp
+
         group_name = group.name
 
         count = 0
@@ -42,7 +45,7 @@ module Jobs
                  Discourse::InvalidParameters => e
 
             logger.warn(
-              "Error encountered when trying to download file " +
+              "Error encountered when trying to download from URL '#{old_url}' " +
               "for group '#{group_name}'.\n#{e.class}: #{e.message}\n#{e.backtrace.join("\n")}"
             )
           end

spec/jobs/migrate_group_flair_images_spec.rb

@@ -4,16 +4,21 @@ require 'rails_helper'
 
 RSpec.describe Jobs::MigrateGroupFlairImages do
   let(:image_url) { "https://omg.aws.somestack/test.png" }
-  let(:group) { Fabricate(:group, flair_url: image_url) }
 
   before do
     stub_request(:get, image_url).to_return(
       status: 200, body: file_from_fixtures("smallest.png").read
     )
+    @orig_logger = Rails.logger
+    Rails.logger = @fake_logger = FakeLogger.new
+  end
+
+  after do
+    Rails.logger = @orig_logger
   end
 
   it 'should migrate to the new group `flair_upload_id` column correctly' do
-    group
+    group = Fabricate(:group, flair_url: image_url)
 
     expect do
       described_class.new.execute_onceoff({})
@@ -23,4 +28,10 @@ RSpec.describe Jobs::MigrateGroupFlairImages do
     expect(group.flair_upload).to eq(Upload.last)
     expect(group[:flair_url]).to eq(nil)
   end
+
+  it 'should skip groups with invalid flair URLs' do
+    group = Fabricate(:group, flair_url: "abc")
+    described_class.new.execute_onceoff({})
+    expect(Rails.logger.warnings.count).to eq(0)
+  end
 end