fix: ticketmatic contact import

config/install/migrate_plus.migration.import_ticketmatic_contacts.yml

+langcode: en
+status: true
+dependencies: {  }
 id: import_ticketmatic_contacts
-label: Import Ticketmatic contacts
+class: null
+field_plugin_method: null
+cck_plugin_method: null
+migration_tags: {  }
 migration_group: druplan_demo
-migration_tags: []
-
+label: 'Import Ticketmatic contacts'
 source:
-  plugin: 'migrate_ticketmatic_contacts'
+  plugin: migrate_ticketmatic_contacts
   ids:
     - id
-
 process:
-  name: firstname
+  dummy:
+    plugin: skip_on_empty
+    method: row
+    source: email
+    message: 'Field mail is empty'
+  name: email
   mail: email
-
   status:
     -
       plugin: default_value
       default_value: 1
-  field_type_exists:
-    plugin: skip_on_empty
-    method: row
-    source: mail
-    message: 'Field mail is empty'
-
 destination:
-  plugin: entity:user
+  plugin: 'entity:user'
+migration_dependencies: {  }
 
-migration_dependencies: {}