Improved error handling.

app/models/application_model/assets.rb

@@ -33,6 +33,7 @@ returns
       next if !self[ local_user_id ]
       next if data[ User.to_app_model ] && data[ User.to_app_model ][ self[ local_user_id ] ]
       user = User.lookup(id: self[ local_user_id ])
+      next if !user
       data = user.assets(data)
     }
     data

app/models/channel/assets.rb

@@ -53,6 +53,7 @@ returns
         next if !self[ local_user_id ]
         next if data[ User.to_app_model ] && data[ User.to_app_model ][ self[ local_user_id ] ]
         user = User.lookup(id: self[ local_user_id ])
+        next if !user
         data = user.assets(data)
       }
       data

app/models/history/assets.rb

@@ -25,8 +25,10 @@ returns
 
       if !data[ User.to_app_model ] || !data[ User.to_app_model ][ self['created_by_id'] ]
         user = User.lookup(id: self['created_by_id'])
+        if user
           data = user.assets(data)
         end
+      end
 
       data
     end

app/models/organization/assets.rb

@@ -46,10 +46,10 @@ returns
         local_attributes['member_ids'] = local_member_ids
         if local_member_ids
           local_member_ids.each {|local_user_id|
-            if !data[ User.to_app_model ][ local_user_id ]
+            next if data[ User.to_app_model ][ local_user_id ]
             user = User.lookup(id: local_user_id)
+            next if !user
             data = user.assets(data)
-            end
           }
         end
 
@@ -59,6 +59,7 @@ returns
         next if !self[ local_user_id ]
         next if data[ User.to_app_model ][ self[ local_user_id ] ]
         user = User.lookup(id: self[ local_user_id ])
+        next if !user
         data = user.assets(data)
       }
       data

app/models/ticket/article/assets.rb

@@ -45,6 +45,7 @@ returns
       next if !self[ local_user_id ]
       next if data[ User.to_app_model ] && data[ User.to_app_model ][ self[ local_user_id ] ]
       user = User.lookup(id: self[ local_user_id ])
+      next if !user
       data = user.assets(data)
     }
     data

app/models/ticket/assets.rb

@@ -32,6 +32,7 @@ returns
       next if !self[ local_user_id ]
       next if data[ User.to_app_model ] && data[ User.to_app_model ][ self[ local_user_id ] ]
       user = User.lookup(id: self[ local_user_id ])
+      next if !user
       data = user.assets(data)
     }
     data

app/models/user/assets.rb

@@ -112,6 +112,7 @@ returns
         next if !self[ local_user_id ]
         next if data[ User.to_app_model ][ self[ local_user_id ] ]
         user = User.lookup(id: self[ local_user_id ])
+        next if !user
         data = user.assets(data)
       }
       data