maven-deploy: don't require id

The id element is eg. not needed for file deployment so don't make it
mandatory.

Change-Id: Ide83b18cbab6010033c3bd8e8264595d1d2d5fa2

jenkins_jobs/modules/publishers.py

@@ -2002,7 +2002,8 @@ def maven_deploy(parser, xml_parent, data):
     """
 
     p = XML.SubElement(xml_parent, 'hudson.maven.RedeployPublisher')
-    XML.SubElement(p, 'id').text = data['id']
+    if 'id' in data:
+        XML.SubElement(p, 'id').text = data['id']
     XML.SubElement(p, 'url').text = data['url']
     XML.SubElement(p, 'uniqueVersion').text = str(
         data.get('unique-version', True)).lower()

tests/publishers/fixtures/mavendeploy001.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" ?>
+<project>
+  <publishers>
+    <hudson.maven.RedeployPublisher>
+      <url>file:///path/to/repo</url>
+      <uniqueVersion>true</uniqueVersion>
+      <evenIfUnstable>false</evenIfUnstable>
+    </hudson.maven.RedeployPublisher>
+  </publishers>
+</project>

tests/publishers/fixtures/mavendeploy001.yaml

@@ -0,0 +1,4 @@
+publishers:
+  - maven-deploy:
+      url: file:///path/to/repo
+