Ignore error messages from anki-connect guiBrowse actions

If a guiBrowse action fails, the rest of the app can still work, you
just might risk your card not updating if you have it open in the
browser, similar to when you have the "Do not update Anki browser"
option selected.

For #32 however, you don't even risk that by ignoring the error message,
so there's no downsides to ignoring it. Just log the error and move on.

extension/bg/js/anki.js

@@ -39,20 +39,28 @@ class AnkiConnect {
     }
 
     async showNoCardsInGui() {
-        return await this._invoke('guiBrowse', {query: "nid:1 nid:2"})
+        return await this.guiBrowse({query: "nid:1 nid:2"})
     }
 
     async showCurrentDeckInGui() {
         var deck = this._settings.ankiDeck || "current";
-        return await this._invoke('guiBrowse', {query: `"deck:${deck}"`})
+        return await this.guiBrowse({query: `"deck:${deck}"`})
     }
 
     async runCustomBrowserQuery(query) {
-        return await this._invoke('guiBrowse', {query: query})
+        return await this.guiBrowse({query: query})
     }
 
     async showNoteInGui(noteId) {
-        return await this._invoke('guiBrowse', {query: "nid:" + noteId})
+        return await this.guiBrowse({query: "nid:" + noteId})
+    }
+
+    async guiBrowse(params) {
+        try {
+            return await this._invoke('guiBrowse', params)
+        } catch (e) {
+            console.warn("Ignoring error from Anki: " + e.message);
+        }
     }
 
     async _invoke(action, params) {