add default for project polyline

app/controllers/api/pm/projects_controller.rb

@@ -77,6 +77,12 @@ class Api::Pm::ProjectsController < Api::Pm::BaseController
           "2": @create_issues_count[[2,current_time]] || 0,
           "3": @create_issues_count[[3,current_time]] || 0
         }
+      else
+        data[:create_issues][current_time] = {
+          "1": 0,
+          "2": 0,
+          "3": 0
+        }
       end
       if @due_issues_count.present?
         data[:due_issues][current_time] = {
@@ -84,6 +90,12 @@ class Api::Pm::ProjectsController < Api::Pm::BaseController
           "2": @due_issues_count[[2,current_time]] || 0,
           "3": @due_issues_count[[3,current_time]] || 0
         }
+      else
+        data[:due_issues][current_time] = {
+          "1": 0,
+          "2": 0,
+          "3": 0
+        }
       end
     end
     render_ok(data: data)