run validations even when invite_key is blank. fix scambra#136

lib/devise_invitable/model.rb

@@ -131,7 +131,7 @@ def _invite(attributes={}, invited_by=nil, &block)
             invitable.errors.add(invite_key, :taken) unless invitable.invited? && self.resend_invitation
           end
 
-          if invitable.errors.empty?
+          if self.validate_on_invite || invitable.errors.empty?
             yield invitable if block_given?
             mail = invitable.invite!
           end

lib/devise_invitable/version.rb

@@ -1,3 +1,3 @@
 module DeviseInvitable
-  VERSION = '0.5.5'
+  VERSION = '0.5.6'
 end

test/models/invitable_test.rb

@@ -173,7 +173,16 @@ def setup
     validate_on_invite = User.validate_on_invite
     User.validate_on_invite = true
     invited_user = User.invite!(:email => "valid@email.com", :username => "a"*50)
-    assert !invited_user.errors.empty?
+    assert invited_user.errors[:username].present?
+    User.validate_on_invite = validate_on_invite
+  end
+
+  test 'should validate other attributes when validate_on_invite is enabled and email is not present' do
+    validate_on_invite = User.validate_on_invite
+    User.validate_on_invite = true
+    invited_user = User.invite!(:email => "", :username => "a"*50)
+    assert invited_user.errors[:email].present?
+    assert invited_user.errors[:username].present?
     User.validate_on_invite = validate_on_invite
   end