fixed behavior for broken umd

app/collections.hoon

@@ -431,6 +431,9 @@
     =/  parent-path  (scag (dec (lent pax)) pax)
     ::
     ?-    -.new
+    ::
+        %error
+      (ta-hall-lin parent-path 'error')
     ::
         %collection
       =.  ta-this
@@ -474,6 +477,9 @@
     =/  parent  (scag (dec (lent pax)) pax)
     ::  recurse for children
     ?-    -.old
+    ::
+        %error
+      (ta-hall-lin parent 'error')
     ::
         %collection
       =.  ta-this  
@@ -558,6 +564,18 @@
       =.  ta-this  (ta-remove-item [%raw raw.old] pax)
       (ta-update-collection col.old col.new pax)
     ::
+    ::
+    ?:  &(?=(%error -.old) ?=(%error -.new))
+      ta-this
+    ?:  &(?=(%error -.old) ?=(%collection -.new))
+      (ta-insert-item new pax)
+    ?:  &(?=(%error -.old) ?=(%raw -.new))
+      (ta-insert-item new pax)
+    ?:  &(?=(%error -.old) ?=(%both -.new))
+      (ta-insert-item new pax)
+    ?:  ?=(%error -.new)
+      (ta-hall-lin pax 'error')
+    ::
     ta-this
   ::
   ++  ta-update-raw-item
@@ -584,19 +602,6 @@
       ::  delete comments
       (ta-remove (weld pax /collections-config))
     ::
-    ::  check if file has been modified
-    ::  and if so update last modified field
-::    =/  told  (trip data.old)
-::    =/  newt  (trip data.new)
-::    =/  old-con  (slag (need (find ";>" told)) told)
-::    =/  new-con  (slag (need (find ";>" newt)) newt)
-::    =?  ta-this  !=(old-con new-con)
-::      =/  contents=@t
-::        %+  update-umd-front
-::        (~(put by meta.new) %last-modified (scot %da now.bol))
-::        data.new
-::      (ta-write (weld pax /umd) %umd !>(contents))
-    ::
     ta-this
   ::
   ++  ta-update-collection
@@ -733,7 +738,7 @@
       act  t.act
     ==
   ::
-  ++  ta-hall-create-circle  ::
+  ++  ta-hall-create-circle
     |=  [pax=path description=@t]
     ^+  ta-this
     =/  circ=circle:hall  (path-to-circle pax)

lib/collections.hoon

@@ -8,10 +8,11 @@
 |%
 +=  collection  [meta=config data=(map nom=knot =item)]  
 +=  item
-  $~  [%raw %umd ~ %$]
+  $~  [%error ~]
   $%  [%collection col=collection]
       [%raw raw=raw-item]
       [%both col=collection raw=raw-item]
+      [%error ~]
   ==
 +=  raw-item
   $%  [%umd meta=(map knot cord) data=@t]
@@ -53,6 +54,22 @@
   $%  [%umd @t]
       [%collections-config config]
   ==
+::
+++  collection-error
+  |=  col=collection
+  ^-  ?
+  |-
+  =/  vals=(list item)  ~(val by data.col)
+  %+  roll  vals
+  |=  [i=item out=_|]
+  ^-  ?
+  ?:  out  out
+  ?+  -.i
+    %.n
+    %error       %.y
+    %collection  ^$(col col.i)
+    %both        ^$(col col.i)
+  ==
 ::::
 ::::  /mar/snip
 ::::
@@ -99,6 +116,7 @@
   |=  itm=item
   ^-  json
   ?-    -.itm
+      %error  (frond:enjs:format %error ~)
   ::
       %collection
     %+  frond:enjs:format

ren/collections/elem.hoon

@@ -21,6 +21,8 @@
   ;div.container
     ;+
       ?+    -.itm  !!
+          %error  ;div: 404
+        ::
           %collection
         ?+    sho  !!
         ::
@@ -87,13 +89,17 @@
   |=  col=collection:collections
   ^-  manx
   ;ul.vanilla
-    ;*  %+  turn
+    ;*  %+  roll
           %+  sort  ~(tap by data.col)
           |=  [[knot a=item:collections] [knot b=item:collections]]
           =/  a-dat  (extract-date-created a)
           =/  b-dat  (extract-date-created b)
           (lth a-dat b-dat)
-        |=  [nom=knot ite=item:collections]
+        |=  [[nom=knot ite=item:collections] out=marl]
+        ^-  marl
+        ?:  ?=(%error -.ite)
+          out
+        :_  out
         ^-  manx
         ;li.collection-post.mt-6
           ;+  (item-to-snip nom ite)
@@ -142,7 +148,8 @@
               ;div.mr-2
                 =urb-component  "Sigil"
                 =urb-ship       "{(trip owner)}"
-                =urb-size       "18";
+                =urb-size       "18"
+                =urb-suffix     "true";
               ;div
                 ;a.vanilla.text-mono.text-small.text-700.mr-4
                   =href  "/~~/landscape/profile"
@@ -170,6 +177,7 @@
   |=  i=item:collections
   ^-  @da
   ?-  -.i
+    %error       *@da
     %collection  date-created.meta.col.i
     %both        date-created.meta.col.i
     %raw         (slav %da (~(got by meta.raw.i) %date-created))
@@ -181,6 +189,8 @@
   |=  [nom=knot itm=item:collections]
   ^-  manx
   ?-    -.itm
+      %error
+    ;div: 404
       %collection
     (collection-to-snip nom col.itm)
       %raw
@@ -276,6 +286,7 @@
   %+  weld  mat
   ^-  mart
   ?-    -.itm
+      %error  ~
       %collection
     =*  met  meta.col.itm
     :~  [%urb-name (trip name.met)]

ren/collections/item.hoon

@@ -24,7 +24,7 @@
           ==
       ?~  raw
         ?~  col
-          !!
+          [%error ~]
         [%collection col]
       ?~  col
         [%raw raw]

ren/collections/web-item.hoon

@@ -34,7 +34,7 @@
 ^-  item:collections
 ?~  col
   ?~  raw
-    !!
+    [%error ~]
   [%raw raw]
 ::
 ?:  ?=(%no-config -.col)
@@ -43,7 +43,7 @@
       [%collection *config:collections items.col]
     [%both [*config:collections items.col] raw]
   ?~  raw
-    !!
+    [%error ~]
   [%raw raw]
 ?~  raw
   [%collection config.col items.col]