fix: user.project_admin_of? with nil project

This was returning nil instead of false which then caused nothing to be output in the glossary edit html javascript section breaking the glossary view link when the user was not a an admin or project admin.

app/models/user.rb

@@ -50,7 +50,7 @@ def is_project_admin?()
   end
 
   def project_admin_of?(project)
-    project && admined_projects.any? {|ap| ap.id == project.id }
+    !!(project && admined_projects.any? {|ap| ap.id == project.id })
   end
 
   def most_recent_authentication

spec/models/user_spec.rb

@@ -514,6 +514,7 @@
       expect(user.project_admins.length).to be(0)
       expect(user.admined_projects.length).to be(0)
 
+      expect(user.project_admin_of?(nil)).to be(false)
       expect(user.project_admin_of?(project1)).to be(false)
       expect(user.project_admin_of?(project2)).to be(false)
     end