Issue #3321292: Url source with JSON data parser throws exception with migmap_lookup process plugin

migmag_process/src/MigMagMigrateStub.php

@@ -158,11 +158,7 @@ class MigMagMigrateStub extends MigrateStub {
             }
           }
           $stub_should_be_created = TRUE;
-
-          // Stubbing needs prepareRow.
-          if ($source_plugin->prepareRow($row)) {
-            $rows_to_stub[] = $row;
-          }
+          $rows_to_stub[] = $row;
         }
       }
       catch (\Exception $e) {