dont fallback to icons for waveforms

copyparty/httpcli.py

@@ -2532,6 +2532,9 @@ class HttpCli(object):
                 if thp:
                     return self.tx_file(thp)
 
+                if th_fmt == "p":
+                    raise Pebkac(404)
+
                 return self.tx_ico(rem)
 
         if not is_dir and (self.can_read or self.can_get):

copyparty/th_cli.py

@@ -30,6 +30,8 @@ class ThumbCli(object):
 
         try:
             c = hsrv.th_cfg
+            if not c:
+                raise Exception()
         except:
             c = {k: {} for k in ["thumbable", "pil", "vips", "ffi", "ffv", "ffa"]}