slapos_cloud: fixup slapos_update_compute_node_capacity_scope tests

master/bt5/slapos_cloud/TestTemplateItem/portal_components/test.erp5.SlapOSTestCaseMixin.py

@@ -344,8 +344,12 @@ class SlapOSTestCaseMixin(testSlapOSMixin):
   def _makeSlaveTree(self, project, requested_template_id='template_slave_instance'):
     return self._makeTree(project, requested_template_id=requested_template_id)
 
-  def addComputeNodeAndPartition(self, project):
+  def addComputeNodeAndPartition(self, project=None):
     # XXX replace _makeComputeNode
+    if project is None:
+      project = self.addProject()
+      self.tic()
+
     reference = 'TESTCOMP-%s' % self.generateNewId()
     compute_node = self.portal.compute_node_module.newContent(
       portal_type="Compute Node",