Fix: bug when you try to add empty organiser to chapter

I added validation in the organisers controller to show a message if user tried to click add organiser without selecting one from the dropdown

Author: davidmillen50

app/controllers/admin/chapters/organisers_controller.rb

@@ -12,6 +12,11 @@ def index
   def create
     authorize :organiser
 
+    if params[:organiser].blank? || params[:organiser][:organiser].blank?
+      flash[:alert] = 'Please select a member to make organiser.'
+      redirect_to admin_chapter_organisers_path(@chapter) and return
+    end
+
     member = Member.find(params[:organiser][:organiser])
     member.add_role(:organiser, @chapter)
 

app/views/admin/chapters/organisers/index.html.haml

@@ -1,4 +1,8 @@
 .container.py-4.py-lg-5.organisers
+  - if flash[:notice]
+    .alert.alert-success= flash[:notice]
+  - if flash[:alert]
+    .alert.alert-danger= flash[:alert]
   .row.mb-4
     .col
       %h1