new BUG-87 - faces with empty locn and no formal connection between file and face? Quick hack added to files as well to at least prevent a 500 server fault, and show it to us if it happens again

BUGs

@@ -1,4 +1,20 @@
-### Next: 87
+### Next: 88
 BUG-60: entries per page in flat view will get how_many from each top-level dir in PATH - causes viewer to get lost in eids for last_eid
 BUG-85: once we rebuild data from scratch, need to reset just clean out pa_user_state's
 BUG-86: had some face locn data be in { } not [ ] again -- I think we need to stop using locn in the DB and instead use a tmp_locn or something else -- no way to touch the DB data then
+BUG-87: using Person->show matches->then view an image shows bug in viewer with msising data in json -- that same image via a filename search works...
+	-- seems some faces have an empty locn, but do have a w and h... (ORM - tmp_locn vs locn???)
+	# select id, locn, w, h from face where locn is null;
+	(count shows 500+ at the moment)
+
+	interestingly, there is a face for todd in this file:
+	693, is there more than 1????
+
+	HMMM, or when I delete Richard Tan?? (but 500???)
+	still, the face with no locn also is not connected to any file, SO, why is it a part of the view / select data (is it in the set where we do an AI: search for all AI searches, because its more than todd that fails AI)
+
+	OKAY, there is something wrong in the DB on several levels, searched on AI:craig, I get 34211 as a hit, BUT, viewing that file, there is no face at all - feels unlikely, checking DB:
+
+	I deleted all faces with no locn, maybe it is a one-off with all the crap I
+	did with the ORM / tmp_locn.... Will see if it comes back, this stays as a
+	bug for now

files.py

@@ -723,7 +723,15 @@ def view(id):
             continue
         # put locn data back into array format 
         for face in e.file_details.faces:
+            if face.locn:
                 face.locn = json.loads(face.locn)
+            else:
+				# this at least stops a 500 server error - seems to occur when
+				# DB contains disconnected faces with no locn data - BUG: 87
+                face.locn = [ 0,0,0,0 ]
+                st.SetMessage( f"For some reason this face does not have a locn: face_id={face.id} tell ddp", "warning" )
+
+
 
     eids=eids.rstrip(",")
     # jic, sometimes we trip this, and rather than show broken pages / destroy