Handle blocked_until nil on the blocked jobs list

Fixes #259

Author: brunoarueira

app/views/mission_control/jobs/jobs/blocked/_job.html.erb

@@ -1,6 +1,7 @@
 <td><%= link_to job.queue_name, application_queue_path(@application, job.queue) %></td>
-<td><div class="is-family-monospace is-size-7"><%= job.blocked_by %></div>
-    <div class="has-text-grey is-size-7">Expires <%= bidirectional_time_distance_in_words_with_title(job.blocked_until) %></div>
+<td>
+  <div class="is-family-monospace is-size-7"><%= job.blocked_by %></div>
+  <div class="has-text-grey is-size-7"><%= job.blocked_until ? "Expires #{bidirectional_time_distance_in_words_with_title(job.blocked_until)}" : "" %></div>
 </td>
 <td class="pr-0">
   <%= render "mission_control/jobs/jobs/blocked/actions", job: job %>

test/system/blocked_jobs_test.rb

@@ -0,0 +1,62 @@
+require_relative "../application_system_test_case"
+
+class BlockedJobsTest < ApplicationSystemTestCase
+  setup do
+    # Find a SolidQueue server to use for this test
+    @solid_queue_server = MissionControl::Jobs.applications.first.servers.find { |s| s.queue_adapter_name == :solid_queue }
+    
+    # Skip if SolidQueue is not available
+    skip "SolidQueue adapter not available for testing" unless @solid_queue_server
+    
+    # Use the SolidQueue server's activating method to switch adapters temporarily
+    @solid_queue_server.activating do
+      # Create jobs with SolidQueue adapter
+      BlockingJob.perform_later(10)
+      BlockingJob.perform_later(20)
+      
+      # Get the last job
+      job = ActiveJob.jobs.blocked.last
+      
+      # Make sure the job has nil blocked_until
+      if job.respond_to?(:blocked_execution) && job.blocked_execution
+        job.blocked_execution.update!(expires_at: nil)
+      end
+    end
+    
+    # Visit the blocked jobs page with SolidQueue active
+    @solid_queue_server.activating do
+      visit jobs_path(:blocked)
+    end
+  end
+
+  test "displays blocked jobs with expiration date" do
+    @solid_queue_server.activating do
+      assert_text "10"
+      assert_text "Expires"
+    end
+  end
+
+  test "displays blocked jobs without expiration date" do
+    @solid_queue_server.activating do
+      assert_text "20"
+      
+      within_job_row "20" do
+        # The expiration message should be empty when blocked_until is nil
+        assert page.has_selector?(".has-text-grey.is-size-7", text: "")
+      end
+    end
+  end
+
+  test "run now button works for blocked jobs" do
+    @solid_queue_server.activating do
+      assert_equal 2, job_row_elements.length
+      
+      within_job_row "10" do
+        click_on "Run now"
+      end
+      
+      assert_text "Dispatched"
+      assert_equal 1, job_row_elements.length
+    end
+  end
+end