Bug 1605489 - Do not report missing files from L10nRegistry.loadSync to the console. r=mossop

Differential Revision: https://phabricator.services.mozilla.com/D58152

--HG--
extra : moz-landing-system : lando

intl/l10n/L10nRegistry.jsm

@@ -777,7 +777,7 @@ this.L10nRegistry.loadSync = function(uri) {
       } catch (e) {
         Cu.reportError(e);
       }
-    } else {
+    } else if (e.result != Cr.NS_ERROR_FILE_NOT_FOUND) {
       Cu.reportError(e);
     }
   }