Stop lock errors for deleted projects
Stop lock errors for deleted projects

Stops errors being logged when a user deletes a project but leaves the
plan editing page open in another tab/browser.

DigitalCurationCentre/DMPonline_v4,cau-vfu/DMPonline_v4,cau-vfu/DMPonline_v4,cau-vfu/DMPonline_v4,BibNumUMontreal/DMPonline_v4,BibNumUMontreal/DMPonline_v4,BibNumUMontreal/DMPonline_v4,DigitalCurationCentre/DMPonline_v4,DigitalCurationCentre/DMPonline_v4