Gracefully handle invalid query parameters for custom fields (#35312).

Patch by Holger Just.


git-svn-id: http://svn.redmine.org/redmine/trunk@21012 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/issues_controller.rb

@@ -29,6 +29,7 @@ class IssuesController < ApplicationController
   accept_api_auth :index, :show, :create, :update, :destroy
 
   rescue_from Query::StatementInvalid, :with => :query_statement_invalid
+  rescue_from Query::QueryError, :with => :query_error
 
   helper :journals
   helper :projects
@@ -470,6 +471,11 @@ class IssuesController < ApplicationController
 
   private
 
+  def query_error(exception)
+    session.delete(:issue_query)
+    super
+  end
+
   def retrieve_previous_and_next_issue_ids
     if params[:prev_issue_id].present? || params[:next_issue_id].present?
       @prev_issue_id = params[:prev_issue_id].presence.try(:to_i)