messagegui: Fix bugs related to empty titles and bodies.

Fixes #3969.  Notification events can now have title or body as empty strings
or `undefined` without errors.  Tested from console using the below
notification messages sent from console.  Prior to this commit, all but the
two marked test messages created errors.

GB({"t":"notify", "id":987123, "title":"Title"})
GB({"t":"notify", "id":987124, "title":"Title", "body":""})
GB({"t":"notify", "id":987125, "body":"Body"})
GB({"t":"notify", "id":987126, "title":"", "body":"Body"}) // worked before this commit
GB({"t":"notify", "id":987127, "title":""})
GB({"t":"notify", "id":987128, "body":""})
GB({"t":"notify", "id":987129}) // does nothing

Author: randyheydon

apps/messagegui/ChangeLog

@@ -117,4 +117,5 @@
       Remove workaround for 2v10 (>3 years ago) - assume everyone is on never firmware now
 0.86: Default to showing message scroller (with title, bigger icon)
 0.87: Make choosing of font size more repeatable
-0.88: Adjust padding calculation so messages are spaced out properly even when using international fonts
+0.88: Adjust padding calculation so messages are spaced out properly even when using international fonts
+0.89: Fix bugs related to empty titles and bodies

apps/messagegui/app.js

@@ -361,12 +361,12 @@ function showMessage(msgid, persist) {
   active = "message";
   // Normal text message display
   let src=msg.src||/*LANG*/"Message", srcFont = fontSmall;
-  let title=msg.title, titleFont = fontLarge, lines;
+  let title=msg.title||"", titleFont = fontLarge, lines=[];
   let body=msg.body, bodyFont = fontLarge;
   // If no body, use the title text instead...
-  if (body===undefined) {
+  if (!body) {
     body = title;
-    title = undefined;
+    title = "";
   }
   if (g.setFont(srcFont).stringWidth(src) > g.getWidth()-52)
     srcFont = "4x6";

apps/messagegui/metadata.json

@@ -2,7 +2,7 @@
   "id": "messagegui",
   "name": "Message UI",
   "shortName": "Messages",
-  "version": "0.88",
+  "version": "0.89",
   "description": "Default app to display notifications from iOS and Gadgetbridge/Android",
   "icon": "app.png",
   "type": "app",