Report every failed fetch instead of discarding it

Twenty-four fetch chains ended in an empty catch, which is not error handling
but error deletion: the request fails, nothing renders, nothing is logged, and
the surface sits on Loading forever. That is how the mesh chat's ReferenceError
read as a slow load for as long as it did.

Plugin/unraid/pages/monitor.php

@@ -2087,7 +2087,7 @@ function vvLoadTokens() {
   return fetch('/plugins/varaverk/api/ai.php?action=tokens')
     .then(r => r.json())
     .then(d => { if (d.ok) { vvTokData = d.tokens; vvRenderTokens(); } })
-    .catch(() => {});
+    .catch(e => vvFetchErr('token ledger', e));
 }
 
 function vvRenderTokens() {
@@ -2522,7 +2522,7 @@ function vvPollStreams() {
       }
       vvRenderStreams();
     })
-    .catch(() => {});
+    .catch(e => vvFetchErr('media streams', e));
 }
 
 // An unreachable partner is stated, never folded into the totals as zero. "Nobody is watching