don't fail when pulp cli didn't return valid json

definitions/features/pulpcore.rb

@@ -25,7 +25,14 @@ def cli(args)
   end
 
   def running_tasks
-    cli('task list --state-in running --state-in canceling')
+    tasks = cli('task list --state-in running --state-in canceling')
+    # cli() uses parse_json() which swallows JSON::ParserError and returns nil
+    # but running_tasks should return an Array
+    if tasks.nil?
+      []
+    else
+      tasks
+    end
   rescue ForemanMaintain::Error::ExecutionError
     []
   end

test/definitions/features/pulpcore_test.rb

@@ -34,6 +34,12 @@
         raises(ForemanMaintain::Error::ExecutionError.new('', 1, '', ''))
       assert_empty subject.running_tasks
     end
+
+    it 'returns an empty list when pulp cli returned unparseable json' do
+      subject.expects(:execute!).
+        with('pulp --format json task list --state-in running --state-in canceling').returns('JZon')
+      assert_empty subject.running_tasks
+    end
   end
 
   describe '.cli_available?' do