Check_MK Werk 5202: Fixed timeouts when generating reports (regression in #4957)

ID: 5202 Title: Fixed timeouts when generating reports (regression in #4957) Component: Reporting & Availability Level: 2 Class: Bug fix Version: 1.5.0i1 When creating PDF reports that contain grouped view elements, these reports were rendering too many data. In case of larger reports with a lot of graphs, this could lead to timeouts resulting in "Proxy Errors" messages in the GUI. This issue was introduced with werk 4957 since Check_MK 1.4.0p9.