Merge branch 'zero-project-creation-error-message' into 'master'

Updated error message when project limit is zero

When the project limit is zero & the user tries to create a project, the
error displayed is now 'Personal project creation is not allowed. Please
contact your administrator with questions'

Closes #17691

See merge request !4280

app/models/project.rb

@@ -431,7 +431,13 @@ def safe_import_url
 
   def check_limit
     unless creator.can_create_project? or namespace.kind == 'group'
-      self.errors.add(:limit_reached, "Your project limit is #{creator.projects_limit} projects! Please contact your administrator to increase it")
+      projects_limit = creator.projects_limit
+
+      if projects_limit == 0
+        self.errors.add(:limit_reached, "Personal project creation is not allowed. Please contact your administrator with questions")
+      else
+        self.errors.add(:limit_reached, "Your project limit is #{projects_limit} projects! Please contact your administrator to increase it")
+      end
     end
   rescue
     self.errors.add(:base, "Can't check your ability to create project")

spec/models/project_spec.rb

@@ -60,7 +60,7 @@
       project2 = build(:project)
       allow(project2).to receive(:creator).and_return(double(can_create_project?: false, projects_limit: 0).as_null_object)
       expect(project2).not_to be_valid
-      expect(project2.errors[:limit_reached].first).to match(/Your project limit is 0/)
+      expect(project2.errors[:limit_reached].first).to match(/Personal project creation is not allowed/)
     end
   end